# rsync(1) [x11r4 man page]

rsync(1)																  rsync(1)

NAME
rsync - a fast, versatile, remote (and local) file-copying tool

SYNOPSIS
Local:  rsync [OPTION...] SRC... [DEST]

Access via remote shell:
Pull: rsync [OPTION...] [USER@]HOST:SRC... [DEST]
Push: rsync [OPTION...] SRC... [USER@]HOST:DEST

Access via rsync daemon:
Pull: rsync [OPTION...] [USER@]HOST::SRC... [DEST]
rsync [OPTION...] rsync://[USER@]HOST[:PORT]/SRC... [DEST]
Push: rsync [OPTION...] SRC... [USER@]HOST::DEST
rsync [OPTION...] SRC... rsync://[USER@]HOST[:PORT]/DEST

Usages with just one SRC arg and no DEST arg will list the source files instead of copying.

DESCRIPTION
Rsync  is  a  fast  and	extraordinarily  versatile file copying tool.  It can copy locally, to/from another host over any remote shell, or
to/from a remote rsync daemon.  It offers a large number of options that control every aspect of its  behavior  and  permit  very  flexible
specification  of the set of files to be copied.  It is famous for its delta-transfer algorithm, which reduces the amount of data sent over
the network by sending only the differences between the source files and the existing files in the destination.	Rsync is widely  used  for
backups and mirroring and as an improved copy command for everyday use.

Rsync  finds  files that need to be transferred using a "quick check" algorithm (by default) that looks for files that have changed in size
or in last-modified time.  Any changes in the other preserved attributes (as requested  by  options)  are  made	on  the  destination  file
directly when the quick check indicates that the file's data does not need to be updated.

Some of the additional features of rsync are:

o      support for copying links, devices, owners, groups, and permissions

o      exclude and exclude-from options similar to GNU tar

o      a CVS exclude mode for ignoring the same files that CVS would ignore

o      can use any transparent remote shell, including ssh or rsh

o      does not require super-user privileges

o      pipelining of file transfers to minimize latency costs

o      support for anonymous or authenticated rsync daemons (ideal for mirroring)

GENERAL
Rsync  copies  files  either to or from a remote host, or locally on the current host (it does not support copying files between two remote
hosts).

There are two different ways for rsync to contact a remote system: using a remote-shell program as the transport (such as ssh  or  rsh)	or
contacting  an rsync daemon directly via TCP.  The remote-shell transport is used whenever the source or destination path contains a single
colon (:) separator after a host specification.	Contacting an rsync daemon directly happens when the source or destination path contains a
double colon (::) separator after a host specification, OR when an rsync:// URL is specified (see also the "USING RSYNC-DAEMON FEATURES VIA
A REMOTE-SHELL CONNECTION" section for an exception to this latter rule).

As a special case, if a single source arg is specified without a destination, the files are listed in an output format similar to "ls -l".

As expected, if neither the source or destination path specify a remote host, the copy occurs locally (see also the --list-only option).

Rsync refers to the local side as the "client" and the remote side as the "server".  Don't confuse "server" with an rsync daemon -- a  dae-
mon is always a server, but a server can be either a daemon or a remote-shell spawned process.

SETUP
See the file README for installation instructions.

Once  installed,  you  can  use	rsync to any machine that you can access via a remote shell (as well as some that you can access using the
rsync daemon-mode protocol).  For remote transfers, a modern rsync uses ssh for its communications, but it may have been configured to  use
a different remote shell by default, such as rsh or remsh.

You  can  also specify any remote shell you like, either by using the -e command line option, or by setting the RSYNC_RSH environment vari-
able.

Note that rsync must be installed on both the source and destination machines.

USAGE
You use rsync in the same way you use rcp. You must specify a source and a destination, one of which may be remote.

Perhaps the best way to explain the syntax is with some examples:

rsync -t *.c foo:src/

This would transfer all files matching the pattern *.c from the current directory to the directory src on the machine foo. If  any  of  the
files  already  exist on the remote system then the rsync remote-update protocol is used to update the file by sending only the differences
in the data.  Note that the expansion of wildcards on the commandline (*.c) into a list of files is handled by the  shell  before  it  runs
rsync and not by rsync itself (exactly the same as all other posix-style programs).

rsync -avz foo:src/bar /data/tmp

This  would  recursively  transfer  all	files  from the directory src/bar on the machine foo into the /data/tmp/bar directory on the local
machine. The files are transferred in "archive" mode, which ensures that symbolic links, devices, attributes, permissions, ownerships, etc.
are preserved in the transfer.  Additionally, compression will be used to reduce the size of data portions of the transfer.

rsync -avz foo:src/bar/ /data/tmp

A  trailing slash on the source changes this behavior to avoid creating an additional directory level at the destination.  You can think of
a trailing / on a source as meaning "copy the contents of this directory" as opposed to "copy the directory by name", but in both cases the
attributes of the containing directory are transferred to the containing directory on the destination.  In other words, each of the follow-
ing commands copies the files in the same way, including their setting of the attributes of /dest/foo:

rsync -av /src/foo /dest
rsync -av /src/foo/ /dest/foo

Note also that host and module references don't require a trailing slash to copy the contents of the default directory.	For example,  both
of these copy the remote directory's contents into "/dest":

rsync -av host: /dest
rsync -av host::module /dest

You can also use rsync in local-only mode, where both the source and destination don't have a ':' in the name. In this case it behaves like
an improved copy command.

Finally, you can list all the (listable) modules available from a particular rsync daemon by leaving off the module name:

rsync somehost.mydomain.com::

See the following section for more details.

The syntax for requesting multiple files from a remote host is done by specifying additional remote-host args in  the  same  style  as  the
first, or with the hostname omitted.  For instance, all these work:

rsync -av host:file1 :file2 host:file{3,4} /dest/
rsync -av host::modname/file{1,2} host::modname/file3 /dest/
rsync -av host::modname/file1 ::modname/file{3,4}

Older versions of rsync required using quoted spaces in the SRC, like these examples:

rsync -av host:'dir1/file1 dir2/file2' /dest
rsync host::'modname/dir1/file1 modname/dir2/file2' /dest

This word-splitting still works (by default) in the latest rsync, but is not as easy to use as the first method.

If  you	need  to  transfer  a  filename that contains whitespace, you can either specify the --protect-args (-s) option, or you'll need to
escape the whitespace in a way that the remote shell will understand.  For instance:

rsync -av host:'file name with spaces' /dest

CONNECTING TO AN RSYNC DAEMON
It is also possible to use rsync without a remote shell as the transport.  In this case you will directly connect to a remote rsync daemon,
typically  using  TCP  port 873.  (This obviously requires the daemon to be running on the remote system, so refer to the STARTING AN RSYNC
DAEMON TO ACCEPT CONNECTIONS section below for information on that.)

Using rsync in this way is the same as using it with a remote shell except that:

o      you either use a double colon :: instead of a single colon to separate the hostname from the path, or you use an rsync:// URL.

o      the first word of the "path" is actually a module name.

o      the remote daemon may print a message of the day when you connect.

o      if you specify no path name on the remote daemon then the list of accessible paths on the daemon will be shown.

o      if you specify no local destination then a listing of the specified files on the remote daemon is provided.

o      you must not specify the --rsh (-e) option.

An example that copies all the files in a remote module named "src":

rsync -av host::src /dest

Some modules on the remote daemon may require authentication. If so, you will receive a password prompt when you connect. You can avoid the
This may be useful when scripting rsync.

WARNING: On some systems environment variables are visible to all users. On those systems using --password-file is recommended.

You may establish the connection via a web proxy by setting the environment variable RSYNC_PROXY to a hostname:port pair pointing  to  your
web proxy.  Note that your web proxy's configuration must support proxy connections to port 873.

You  may  also  establish a daemon connection using a program as a proxy by setting the environment variable RSYNC_CONNECT_PROG to the com-
mands you wish to run in place of making a direct socket connection.  The string may contain the escape	"%H"  to  represent  the  hostname
specified in the rsync command (so use "%%" if you need a single "%" in your string).  For example:

export RSYNC_CONNECT_PROG='ssh proxyhost nc %H 873'
rsync -av targethost1::module/src/ /dest/
rsync -av rsync:://targethost2/module/src/ /dest/

The  command specified above uses ssh to run nc (netcat) on a proxyhost, which forwards all data to port 873 (the rsync daemon) on the tar-
gethost (%H).

USING RSYNC-DAEMON FEATURES VIA A REMOTE-SHELL CONNECTION
It is sometimes useful to use various features of an rsync daemon (such as named modules) without actually allowing any new socket  connec-
tions into a system (other than what is already required to allow remote-shell access).	Rsync supports connecting to a host using a remote
shell and then spawning a single-use "daemon" server that expects to read its config file in the home dir of the remote user.  This can	be
useful  if  you want to encrypt a daemon-style transfer's data, but since the daemon is started up fresh by the remote user, you may not be
able to use features such as chroot or change the uid used by the daemon.  (For another way to encrypt a daemon	transfer,  consider  using
ssh  to	tunnel	a  local  port	to a remote machine and configure a normal rsync daemon on that remote host to only allow connections from
"localhost".)

From the user's perspective, a daemon transfer via a remote-shell  connection  uses  nearly  the  same  command-line  syntax  as  a  normal
rsync-daemon  transfer,	with  the  only exception being that you must explicitly set the remote shell program on the command-line with the
--rsh=COMMAND option.  (Setting the RSYNC_RSH in the environment will not turn on this functionality.)  For example:

rsync -av --rsh=ssh host::module /dest

If you need to specify a different remote-shell user, keep in mind that the user@ prefix in front of the host is specifying the	rsync-user
value  (for  a  module that requires user-based authentication).  This means that you must give the '-l user' option to ssh when specifying
the remote-shell, as in this example that uses the short version of the --rsh option:

rsync -av -e "ssh -l ssh-user" rsync-user@host::module /dest

The "ssh-user" will be used at the ssh level; the "rsync-user" will be used to log-in to the "module".

STARTING AN RSYNC DAEMON TO ACCEPT CONNECTIONS
In order to connect to an rsync daemon, the remote system needs to have a daemon already running (or it needs to have configured  something
like  inetd  to	spawn  an rsync daemon for incoming connections on a particular port).	For full information on how to start a daemon that
will handling incoming socket connections, see the rsyncd.conf(5) man page -- that is the config file for the daemon, and it  contains  the
full details for how to run the daemon (including stand-alone and inetd configurations).

If you're using one of the remote-shell transports for the transfer, there is no need to manually start an rsync daemon.

SORTED TRANSFER ORDER
Rsync  always  sorts the specified filenames into its internal transfer list.  This handles the merging together of the contents of identi-
cally named directories, makes it easy to remove duplicate filenames, and may confuse someone when the files are transferred in a different
order than what was given on the command-line.

If  you	need a particular file to be transferred prior to another, either separate the files into different rsync calls, or consider using
--delay-updates (which doesn't affect the sorted transfer order, but does make the final file-updating phase happen much more rapidly).

EXAMPLES
Here are some examples of how I use rsync.

To backup my wife's home directory, which consists of large MS Word files and mail folders, I use a cron job that runs

rsync -Cavz . arvidsjaur:backup

each night over a PPP connection to a duplicate directory on my machine "arvidsjaur".

To synchronize my samba source trees I use the following Makefile targets:

get:
rsync -avuzb --exclude '*~' samba:samba/ .
put:
rsync -Cavuzb . samba:samba/
sync: get put

this allows me to sync with a CVS directory at the other end of the connection. I then do CVS operations on the remote machine, which saves
a lot of time as the remote CVS protocol isn't very efficient.

I mirror a directory between my "old" and "new" ftp sites with the command:

rsync -az -e ssh --delete ~ftp/pub/samba nimbus:"~ftp/pub/tridge"

This is launched from cron every few hours.

OPTIONS SUMMARY
Here is a short summary of the options available in rsync. Please refer to the detailed description below for a complete description.

-v, --verbose		    increase verbosity
--info=FLAGS	    fine-grained informational verbosity
--debug=FLAGS	    fine-grained debug verbosity
--msgs2stderr	    special output handling for debugging
-q, --quiet		    suppress non-error messages
--no-motd		    suppress daemon-mode MOTD (see caveat)
-c, --checksum		    skip based on checksum, not mod-time & size
-a, --archive		    archive mode; equals -rlptgoD (no -H,-A,-X)
--no-OPTION 	    turn off an implied OPTION (e.g. --no-D)
-r, --recursive 	    recurse into directories
-R, --relative		    use relative path names
--no-implied-dirs	    don't send implied dirs with --relative
-b, --backup		    make backups (see --suffix & --backup-dir)
--backup-dir=DIR	    make backups into hierarchy based in DIR
--suffix=SUFFIX	    backup suffix (default ~ w/o --backup-dir)
--inplace		    update destination files in-place
--append		    append data onto shorter files
--append-verify	    --append w/old data in file checksum
-d, --dirs		    transfer directories without recursing
-p, --perms		    preserve permissions
-E, --executability	    preserve executability
--chmod=CHMOD	    affect file and/or directory permissions
-A, --acls		    preserve ACLs (implies -p)
-X, --xattrs		    preserve extended attributes
-o, --owner		    preserve owner (super-user only)
-g, --group		    preserve group
--devices		    preserve device files (super-user only)
--specials		    preserve special files
-D			    same as --devices --specials
-t, --times		    preserve modification times
-O, --omit-dir-times	    omit directories from --times
--fake-super	    store/recover privileged attrs using xattrs
-S, --sparse		    handle sparse files efficiently
--preallocate	    allocate dest files before writing
-n, --dry-run		    perform a trial run with no changes made
-W, --whole-file	    copy files whole (w/o delta-xfer algorithm)
-x, --one-file-system	    don't cross filesystem boundaries
-B, --block-size=SIZE	    force a fixed checksum block-size
-e, --rsh=COMMAND	    specify the remote shell to use
--rsync-path=PROGRAM    specify the rsync to run on remote machine
--existing		    skip creating new files on receiver
--ignore-existing	    skip updating files that exist on receiver
--remove-source-files   sender removes synchronized files (non-dir)
--del		    an alias for --delete-during
--delete		    delete extraneous files from dest dirs
--delete-before	    receiver deletes before xfer, not during
--delete-during	    receiver deletes during the transfer
--delete-delay	    find deletions during, delete after
--delete-after	    receiver deletes after transfer, not during
--delete-excluded	    also delete excluded files from dest dirs
--ignore-missing-args   ignore missing source args without error
--delete-missing-args   delete missing source args from destination
--ignore-errors	    delete even if there are I/O errors
--force		    force deletion of dirs even if not empty
--max-delete=NUM	    don't delete more than NUM files
--max-size=SIZE	    don't transfer any file larger than SIZE
--min-size=SIZE	    don't transfer any file smaller than SIZE
--partial		    keep partially transferred files
--partial-dir=DIR	    put a partially transferred file into DIR
--delay-updates	    put all updated files into place at end
-m, --prune-empty-dirs	    prune empty directory chains from file-list
--numeric-ids	    don't map uid/gid values by user/group name
--groupmap=STRING	    custom groupname mapping
--timeout=SECONDS	    set I/O timeout in seconds
--contimeout=SECONDS    set daemon connection timeout in seconds
-I, --ignore-times	    don't skip files that match size and time
--size-only 	    skip files that match in size
--modify-window=NUM     compare mod-times with reduced accuracy
-T, --temp-dir=DIR	    create temporary files in directory DIR
-y, --fuzzy		    find similar file for basis if no dest file
--compare-dest=DIR	    also compare received files relative to DIR
--copy-dest=DIR	    ... and include copies of unchanged files
-z, --compress		    compress file data during the transfer
--compress-level=NUM    explicitly set compression level
--skip-compress=LIST    skip compressing files with suffix in LIST
-C, --cvs-exclude	    auto-ignore files in the same way CVS does
-f, --filter=RULE	    add a file-filtering RULE
-F			    same as --filter='dir-merge /.rsync-filter'
repeated: --filter='- .rsync-filter'
--exclude=PATTERN	    exclude files matching PATTERN
--exclude-from=FILE     read exclude patterns from FILE
--include=PATTERN	    don't exclude files matching PATTERN
--include-from=FILE     read include patterns from FILE
--files-from=FILE	    read list of source-file names from FILE
-0, --from0		    all *from/filter files are delimited by 0s
-s, --protect-args	    no space-splitting; wildcard chars only
--port=PORT 	    specify double-colon alternate port number
--sockopts=OPTIONS	    specify custom TCP options
--blocking-io	    use blocking I/O for the remote shell
--outbuf=N|L|B	    set out buffering to None, Line, or Block
--stats		    give some file-transfer stats
-8, --8-bit-output	    leave high-bit chars unescaped in output
--progress		    show progress during transfer
-P			    same as --partial --progress
-i, --itemize-changes	    output a change-summary for all updates
-M, --remote-option=OPTION  send OPTION to the remote side only
--out-format=FORMAT     output updates using the specified FORMAT
--log-file=FILE	    log what we're doing to the specified FILE
--log-file-format=FMT   log updates using the specified FMT
--list-only 	    list the files instead of copying them
--bwlimit=RATE	    limit socket I/O bandwidth
--stop-at=y-m-dTh:m     Stop rsync at year-month-dayThour:minute
--time-limit=MINS	    Stop rsync after MINS minutes have elapsed
--write-batch=FILE	    write a batched update to FILE
--only-write-batch=FILE like --write-batch but w/o updating dest
--protocol=NUM	    force an older protocol version to be used
--iconv=CONVERT_SPEC    request charset conversion of filenames
--checksum-seed=NUM     set block/file checksum seed (advanced)
-4, --ipv4		    prefer IPv4
-6, --ipv6		    prefer IPv6
--version		    print version number
(-h) --help		    show this help (see below for -h comment)

Rsync can also be run as a daemon, in which case the following options are accepted:

--daemon		    run as an rsync daemon
--bwlimit=RATE	    limit socket I/O bandwidth
--config=FILE	    specify alternate rsyncd.conf file
-M, --dparam=OVERRIDE	    override global daemon config parameter
--no-detach 	    do not detach from the parent
--port=PORT 	    listen on alternate port number
--log-file=FILE	    override the "log file" setting
--log-file-format=FMT   override the "log format" setting
--sockopts=OPTIONS	    specify custom TCP options
-v, --verbose		    increase verbosity
-4, --ipv4		    prefer IPv4
-6, --ipv6		    prefer IPv6
-h, --help		    show this help (if used after --daemon)

OPTIONS
Rsync  accepts  both  long  (double-dash  +  word)  and	short  (single-dash + letter) options.	The full list of the available options are
described below.  If an option can be specified in more than one way, the choices are comma-separated.  Some options only have a long vari-
ant, not a short.  If the option takes a parameter, the parameter is only listed after the long variant, even though it must also be speci-
fied for the short.  When specifying a parameter, you can either use the form --option=param or	replace  the  '='  with  whitespace.   The
parameter  may  need to be quoted in some manner for it to survive the shell's command-line parsing.  Keep in mind that a leading tilde (~)
in a filename is substituted by your shell, so --option=~/foo will not change the tilde into your home directory (remove the '=' for that).

--help Print a short help page describing the options available in rsync and exit.   For  backward-compatibility  with  older  versions	of
rsync, the help will also be output if you use the -h option without any other args.

--version
print the rsync version number and exit.

-v, --verbose
This  option  increases  the amount of information you are given during the transfer.  By default, rsync works silently. A single -v
will give you information about what files are being transferred and a brief summary at the end. Two -v options will give you infor-
mation on what files are being skipped and slightly more information at the end. More than two -v options should only be used if you
are debugging rsync.

In a modern rsync, the -v option is equivalent to the setting of groups of --info and --debug options.  You can choose to use  these
newer  options  in  addition  to,  or in place of using --verbose, as any fine-grained settings override the implied settings of -v.
Both --info and --debug have a way to ask for help that tells you exactly what flags are set for each increase in verbosity.

However, do keep in mind that a daemon's "max verbosity" setting will limit how high of a level the various individual flags can	be
set  on  the  daemon  side.   For instance, if the max is 2, then any info and/or debug flag that is set to a higher value than what
would be set by -vv will be downgraded to the -vv level in the daemon's logging.

--info=FLAGS
This option lets you have fine-grained control over the information output you want to see.  An individual flag name may be followed
by a level number, with 0 meaning to silence that output, 1 being the default output level, and higher numbers increasing the output
of that flag (for those that support higher levels).  Use --info=help to see all the available flag names,  what	they  output,  and
what flag names are added for each increase in the verbose level.  Some examples:

rsync -a --info=progress2 src/ dest/
rsync -avv --info=stats2,misc1,flist0 src/ dest/

Note  that  --info=name's  output  is  affected  by the --out-format and --itemize-changes (-i) options.	See those options for more
information on what is output and when.

This option was added to 3.1.0, so an older rsync on the server side might reject your attempts at fine-grained control (if  one	or
more  flags  needed  to  be  send to the server and the server was too old to understand them).  See also the "max verbosity" caveat
above when dealing with a daemon.

--debug=FLAGS
This option lets you have fine-grained control over the debug output you want to see.  An individual flag name may be followed by  a
level  number,  with 0 meaning to silence that output, 1 being the default output level, and higher numbers increasing the output of
that flag (for those that support higher levels).  Use --debug=help to see all the available flag names, what they output, and  what
flag names are added for each increase in the verbose level.  Some examples:

rsync -avvv --debug=none src/ dest/
rsync -avA --del --debug=del2,acl src/ dest/

Note  that  some	debug  messages will only be output when --msgs2stderr is specified, especially those pertaining to I/O and buffer
debugging.

This option was added to 3.1.0, so an older rsync on the server side might reject your attempts at fine-grained control (if  one	or
more  flags  needed  to  be  send to the server and the server was too old to understand them).  See also the "max verbosity" caveat
above when dealing with a daemon.

--msgs2stderr
This option changes rsync to send all its output directly to stderr rather than to send messages to the client side via the protocol
(which  normally	outputs info messages via stdout).  This is mainly intended for debugging in order to avoid changing the data sent
via the protocol, since the extra protocol data can change what is being tested.	The option does not affect the remote  side  of  a
transfer	without  using --remote-option -- e.g. -M--msgs2stderr.  Also keep in mind that a daemon connection does not have a stderr
channel to send messages back to the client side, so if you are doing any daemon-transfer debugging using this  option,  you  should
start up a daemon using --no-detach so that you can see the stderr output on the daemon side.

This option has the side-effect of making stderr output get line-buffered so that the merging of the output of 3 programs happens in

-q, --quiet
This option decreases the amount of information you are given during the transfer, notably suppressing information messages from the
remote server. This option is useful when invoking rsync from cron.

--no-motd
This  option  affects  the  information  that  is  output by the client at the start of a daemon transfer.  This suppresses the mes-
sage-of-the-day (MOTD) text, but it also affects the list of modules that the daemon sends in response to the "rsync host::" request
(due to a limitation in the rsync protocol), so omit this option if you want to request the list of modules from the daemon.

-I, --ignore-times
Normally	rsync  will skip any files that are already the same size and have the same modification timestamp.  This option turns off
this "quick check" behavior, causing all files to be updated.

--size-only
This modifies rsync's "quick check" algorithm for finding files that need to be transferred, changing it from the default of  trans-
ferring  files with either a changed size or a changed last-modified time to just looking for files that have changed in size.  This
is useful when starting to use rsync after using another mirroring system which may not preserve timestamps exactly.

--modify-window
When comparing two timestamps, rsync treats the timestamps as being equal if they differ by no more than	the  modify-window  value.
This  is	normally 0 (for an exact match), but you may find it useful to set this to a larger value in some situations.  In particu-
lar, when transferring to or from an MS Windows FAT filesystem (which represents times with a  2-second  resolution),  --modify-win-
dow=1 is useful (allowing times to differ by up to 1 second).

-c, --checksum
This  changes  the way rsync checks if the files have been changed and are in need of a transfer.  Without this option, rsync uses a
"quick check" that (by default) checks if each file's size and time of last modification match  between  the  sender  and  receiver.
This  option changes this to compare a 128-bit checksum for each file that has a matching size.  Generating the checksums means that
both sides will expend a lot of disk I/O reading all the data in the files in the transfer (and this is prior to	any  reading  that
will be done to transfer changed files), so this can slow things down significantly.

The  sending  side  generates its checksums while it is doing the file-system scan that builds the list of the available files.  The
receiver generates its checksums when it is scanning for changed files, and will checksum any file that has the  same  size  as  the
corresponding sender's file:  files with either a changed size or a changed checksum are selected for transfer.

Note  that  rsync  always  verifies  that  each  transferred  file  was  correctly reconstructed on the receiving side by checking a
whole-file checksum that is generated as the file is transferred, but that automatic after-the-transfer verification has nothing	to
do with this option's before-the-transfer "Does this file need to be updated?" check.

For protocol 30 and beyond (first supported in 3.0.0), the checksum used is MD5.	For older protocols, the checksum used is MD4.

-a, --archive
This is equivalent to -rlptgoD. It is a quick way of saying you want recursion and want to preserve almost everything (with -H being
a notable omission).  The only exception to the above equivalence is when --files-from  is  specified,  in  which  case  -r  is  not
implied.

Note that -a does not preserve hardlinks, because finding multiply-linked files is expensive.  You must separately specify -H.

--no-OPTION
You may turn off one or more implied options by prefixing the option name with "no-".  Not all options may be prefixed with a "no-":
only options that are implied by other options (e.g. --no-D, --no-perms) or have different defaults in various  circumstances  (e.g.
--no-whole-file,	--no-blocking-io,  --no-dirs).	 You  may  specify either the short or the long option name after the "no-" prefix
(e.g. --no-R is the same as --no-relative).

For example: if you want to use -a (--archive) but don't want -o (--owner), instead of converting -a into -rlptgD, you could specify
-a --no-o (or -a --no-owner).

The  order  of  the  options is important:  if you specify --no-r -a, the -r option would end up being turned on, the opposite of -a
--no-r.  Note also that the side-effects of the --files-from option are NOT positional, as it affects the default state  of  several
options and slightly changes the meaning of -a (see the --files-from option for more details).

-r, --recursive

Beginning  with  rsync  3.0.0,  the  recursive  algorithm used is now an incremental scan that uses much less memory than before and
begins the transfer after the scanning of the first few directories have been completed.	This incremental  scan	only  affects  our
recursion  algorithm,  and does not change a non-recursive transfer.  It is also only possible when both ends of the transfer are at
least version 3.0.0.

Some options require rsync to know the full file list, so these options disable the  incremental	recursion  mode.   These  include:
--delete-before, --delete-after, --prune-empty-dirs, and --delay-updates.  Because of this, the default delete mode when you specify
--delete is now --delete-during when both ends of the connection are at least 3.0.0 (use --del or --delete-during  to  request  this
improved deletion mode explicitly).  See also the --delete-delay option that is a better choice than using --delete-after.

Incremental recursion can be disabled using the --no-inc-recursive option or its shorter --no-i-r alias.

-R, --relative
Use  relative  paths.  This means that the full path names specified on the command line are sent to the server rather than just the
last parts of the filenames. This is particularly useful when you want to send several different directories at the same	time.  For
example, if you used this command:

rsync -av /foo/bar/baz.c remote:/tmp/

... this would create a file named baz.c in /tmp/ on the remote machine. If instead you used

rsync -avR /foo/bar/baz.c remote:/tmp/

then  a  file  named /tmp/foo/bar/baz.c would be created on the remote machine, preserving its full path.  These extra path elements
are called "implied directories" (i.e. the "foo" and the "foo/bar" directories in the above example).

Beginning with rsync 3.0.0, rsync always sends these implied directories as real directories in the file list, even if a	path  ele-
ment  is	really a symlink on the sending side.  This prevents some really unexpected behaviors when copying the full path of a file
that you didn't realize had a symlink in its path.  If you want to duplicate a server-side symlink, include both the symlink via its
path,  and referent directory via its real path.	If you're dealing with an older rsync on the sending side, you may need to use the
--no-implied-dirs option.

It is also possible to limit the amount of path information that is sent as implied directories for each path you specify.   With  a
modern rsync on the sending side (beginning with 2.6.7), you can insert a dot and a slash into the source path, like this:

rsync -avR /foo/./bar/baz.c remote:/tmp/

That  would  create  /tmp/bar/baz.c on the remote machine.  (Note that the dot must be followed by a slash, so "/foo/." would not be
abbreviated.)  For older rsync versions, you would need to use a chdir to limit the source path.	For example, when pushing files:

(cd /foo; rsync -avR bar/baz.c remote:/tmp/)

(Note that the parens put the two commands into a sub-shell, so that the "cd" command doesn't remain in effect for future commands.)
If you're pulling files from an older rsync, use this idiom (but only for a non-daemon transfer):

rsync -avR --rsync-path="cd /foo; rsync"
remote:bar/baz.c /tmp/

--no-implied-dirs
This  option affects the default behavior of the --relative option.  When it is specified, the attributes of the implied directories
from the source names are not included in the transfer.  This means that the corresponding path elements on the  destination  system
are  left  unchanged if they exist, and any missing implied directories are created with default attributes.  This even allows these
implied path elements to have big differences, such as being a symlink to a directory on the receiving side.

For instance, if a command-line arg or a files-from entry told rsync to transfer the file "path/foo/file",  the  directories  "path"
and  "path/foo"  are  implied when --relative is used.  If "path/foo" is a symlink to "bar" on the destination system, the receiving
rsync would ordinarily delete "path/foo", recreate it  as  a  directory,	and  receive  the  file  into  the  new  directory.   With
--no-implied-dirs,  the  receiving rsync updates "path/foo/file" using the existing path elements, which means that the file ends up
being created in "path/bar".  Another way to accomplish this link preservation is to use the --keep-dirlinks option (which will also
affect symlinks to directories in the rest of the transfer).

When pulling files from an rsync older than 3.0.0, you may need to use this option if the sending side has a symlink in the path you
request and you wish the implied directories to be transferred as normal directories.

-b, --backup
With this option, preexisting destination files are renamed as each file is transferred or  deleted.   You  can  control	where  the
backup file goes and what (if any) suffix gets appended using the --backup-dir and --suffix options.

Note  that if you don't specify --backup-dir, (1) the --omit-dir-times option will be implied, and (2) if --delete is also in effect
(without --delete-excluded), rsync will add a "protect" filter-rule for the backup suffix to the end of all your	existing  excludes
(e.g.  -f "P *~").  This will prevent previously backed-up files from being deleted.  Note that if you are supplying your own filter
rules, you may need to manually insert your own exclude/protect rule somewhere higher up in the list so that it has  a  high  enough
priority	to  be	effective  (e.g.,  if your rules specify a trailing inclusion/exclusion of '*', the auto-added rule would never be
reached).

--backup-dir=DIR
In combination with the --backup option, this tells rsync to store all backups in the specified directory  on  the  receiving  side.
This  can  be  used  for incremental backups.  You can additionally specify a backup suffix using the --suffix option (otherwise the
files backed up in the specified directory will keep their original filenames).

Note that if you specify a relative path, the backup directory will be relative to the destination directory, so you  probably  want
to  specify  either an absolute path or a path that starts with "../".  If an rsync daemon is the receiver, the backup dir cannot go
outside the module's path hierarchy, so take extra care not to delete it or copy into it.

--suffix=SUFFIX
This option allows you to override the default backup suffix used with the --backup (-b) option. The default suffix is  a  ~  if	no
--backup-dir was specified, otherwise it is an empty string.

-u, --update
This forces rsync to skip any files which exist on the destination and have a modified time that is newer than the source file.  (If
an existing destination file has a modification time equal to the source file's, it will be updated if the sizes are different.)

Note that this does not affect the copying of dirs, symlinks, or other special files.  Also, a difference of file format between the
sender  and  receiver  is  always  considered to be important enough for an update, no matter what date is on the objects.  In other
words, if the source has a directory where the destination has a file, the transfer would occur regardless of the timestamps.

This option is a transfer rule, not an exclude, so it doesn't affect the data that goes into the file-lists,  and  thus  it  doesn't
affect deletions.  It just limits the files that the receiver requests to be transferred.

--inplace
This  option  changes  how rsync transfers a file when its data needs to be updated: instead of the default method of creating a new
copy of the file and moving it into place when it is complete, rsync instead writes the updated data  directly  to  the  destination
file.

This has several effects:

o      Hard  links are not broken.  This means the new data will be visible through other hard links to the destination file.  More-
over, attempts to copy differing source files onto a multiply-linked destination file will result in a "tug of war" with  the
destination data changing back and forth.

o      In-use  binaries cannot be updated (either the OS will prevent this from happening, or binaries that attempt to swap-in their
data will misbehave or crash).

o      The file's data will be in an inconsistent state during the transfer and will be left that way if the transfer is interrupted
or if an update fails.

o      A	file  that  rsync  cannot  write  to  cannot be updated. While a super user can update any file, a normal user needs to be
granted write permission for the open of the file for writing to be successful.

o      The efficiency of rsync's delta-transfer algorithm may be reduced if some data in the destination file is overwritten  before
it  can  be  copied to a position later in the file.  This does not apply if you use --backup, since rsync is smart enough to
use the backup file as the basis file for the transfer.

WARNING: you should not use this option to update files that are being accessed by others, so be careful when choosing to  use  this
for a copy.

This  option  is	useful	for  transferring large files with block-based changes or appended data, and also on systems that are disk
bound, not network bound.  It can also help keep a copy-on-write filesystem snapshot from diverging the entire contents  of  a  file
that only has minor changes.

The  option  implies  --partial  (since  an  interrupted	transfer  does	not delete the file), but conflicts with --partial-dir and
--delay-updates.	Prior to rsync 2.6.4 --inplace was also incompatible with --compare-dest and --link-dest.

--append
This causes rsync to update a file by appending data onto the end of the file, which presumes that the data that already	exists	on
the  receiving  side is identical with the start of the file on the sending side.  If a file needs to be transferred and its size on
the receiver is the same or longer than the size on the sender, the file is skipped.  This does not interfere with the updating of a
file's  non-content attributes (e.g. permissions, ownership, etc.) when the file does not need to be transferred, nor does it affect
the updating of any non-regular files.  Implies --inplace, but does not conflict with --sparse  (since  it  is  always  extending  a
file's length).

The use of --append can be dangerous if you aren't 100% sure that the files that are longer have only grown by the appending of data
onto the end.  You should thus use include/exclude/filter rules to ensure that such a transfer is only affecting files that you know
to be growing via appended data.

--append-verify
This  works just like the --append option, but the existing data on the receiving side is included in the full-file checksum verifi-
cation step, which will cause a file to be resent if the final verification step fails (rsync uses a normal, non-appending --inplace
transfer for the resend).

Note:  prior  to rsync 3.0.0, the --append option worked like --append-verify, so if you are interacting with an older rsync (or the
transfer is using a protocol prior to 30), specifying either append option will initiate an --append-verify transfer.

-d, --dirs
Tell the sending side to include any directories that are encountered.  Unlike --recursive, a directory's contents  are  not  copied
unless  the directory name specified is "." or ends with a trailing slash (e.g. ".", "dir/.", "dir/", etc.).  Without this option or
the --recursive option, rsync will skip all directories it encounters (and output a message to that effect for each  one).   If  you
specify both --dirs and --recursive, --recursive takes precedence.

The  --dirs  option  is  implied	by  the  --files-from option or the --list-only option (including an implied --list-only usage) if
--recursive wasn't specified (so that directories are seen in the listing).  Specify --no-dirs (or --no-d) if you want to turn  this
off.

There  is  also  a  backward-compatibility  helper  option,  --old-dirs  (or  --old-d)  that  tells  rsync  to  use  a  hack  of "-r
--exclude='/*/*'" to get an older rsync to list a single directory without recursing.

When symlinks are encountered, the item that they point to (the referent) is copied, rather than the symlink.  In older versions	of
modern rsync such as this one, you'll need to specify --keep-dirlinks (-K) to get this extra behavior.  The only exception  is  when
sending  files  to an rsync that is too old to understand -K -- in that case, the -L option will still have the side-effect of -K on
that older receiving rsync.

This tells rsync to copy the referent of symbolic links that point outside the copied tree.  Absolute symlinks are also treated like
ordinary	files, and so are any symlinks in the source path itself when --relative is used.  This option has no additional effect if

This tells rsync to ignore any symbolic links which point outside the copied tree. All absolute symlinks	are  also  ignored.  Using
this option in conjunction with --relative may give unexpected results.

This  option  tells  rsync  to  (1) modify all symlinks on the receiving side in a way that makes them unusable but recoverable (see
below), or (2) to unmunge symlinks on the sending side that had been stored in a munged state.  This is useful if  you  don't  quite
trust the source of the data to not try to slip in a symlink to a unexpected place.

The  way	rsync  disables the use of symlinks is to prefix each one with the string "/rsyncd-munged/".  This prevents the links from
being used as long as that directory does not exist.  When this option is enabled, rsync will refuse to run if that path is a direc-
tory or a symlink to a directory.

The  option  only  affects  the client side of the transfer, so if you need it to affect the server, specify it via --remote-option.
(Note that in a local transfer, the client side is the sender.)

This option has no affect on a daemon, since the daemon configures whether it wants munged symlinks via its "munge symlinks" parame-

This  option  causes  the  sending side to treat a symlink to a directory as though it were a real directory.  This is useful if you
don't want symlinks to non-directories to be affected, as they would be using --copy-links.

Without this option, if the sending side has replaced a directory with a symlink to a directory, the receiving side will delete any-
thing that is in the way of the new symlink, including a directory hierarchy (as long as --force or --delete is in effect).

you can use is to pass them as additional source args with a trailing slash, using --relative to make the paths match up right.  For
example:

rsync -r --relative src/./ src/./follow-me/ dest/

This works because rsync calls lstat(2) on the source arg as given, and the trailing slash makes lstat(2) follow the symlink, giving
rise to a directory in the file-list which overrides the symlink found during the scan of "src/./".

This option causes the receiving side to treat a symlink to a directory as though it were a real directory, but only if it matches a
real directory from the sender.  Without this option, the receiver's symlink would be deleted and replaced with a real directory.

For  example,  suppose  you transfer a directory "foo" that contains a file "file", but "foo" is a symlink to directory "bar" on the

One  note  of caution:  if you use --keep-dirlinks, you must trust all the symlinks in the copy!	If it is possible for an untrusted
user to create their own symlink to any directory, the user could then (on a subsequent copy) replace the symlink with a real direc-
tory  and  affect  the  content of whatever directory the symlink references.  For backup copies, you are better off using something

This tells rsync to look for hard-linked files in the source and link together the corresponding files on the destination.   Without
this option, hard-linked files in the source are treated as though they were separate files.

This option does NOT necessarily ensure that the pattern of hard links on the destination exactly matches that on the source.  Cases
in which the destination may end up with extra hard links include the following:

o      If the destination contains extraneous hard-links (more linking than what is present in the source file  list),  the  copying
algorithm	will  not  break  them	explicitly.   However,	if  one  or more of the paths have content differences, the normal
file-update process will break those extra links (unless you are using the --inplace option).

files can cause some paths in the destination to become linked together due to the --link-dest associations.

Note  that  rsync can only detect hard links between files that are inside the transfer set.  If rsync updates a file that has extra
hard-link connections to files outside the transfer, that linkage will be broken.  If you are tempted to use the --inplace option to
avoid  this  breakage,  be  very	careful  that you know how your files are being updated so that you are certain that no unintended
changes happen due to lingering hard links (and see the --inplace option for more caveats).

If incremental recursion is active (see --recursive), rsync may transfer a missing hard-linked file before  it  finds  that  another
link  for  that contents exists elsewhere in the hierarchy.  This does not affect the accuracy of the transfer (i.e. which files are
hard-linked together), just its efficiency (i.e. copying the data for a new, early copy of a hard-linked file that could	have  been
found  later  in	the transfer in another member of the hard-linked set of files).  One way to avoid this inefficiency is to disable
incremental recursion using the --no-inc-recursive option.

-p, --perms
This option causes the receiving rsync to set the destination permissions to be the same as the source permissions.  (See  also  the
--chmod option for a way to modify what rsync considers to be the source permissions.)

When this option is off, permissions are set as follows:

o      Existing  files  (including  updated files) retain their existing permissions, though the --executability option might change
just the execute permission for the file.

o      New files get their "normal" permission bits set to the source file's  permissions  masked  with  the  receiving  directory's
default  permissions  (either  the  receiving  process's  umask, or the permissions specified via the destination directory's
default ACL), and their special permission bits disabled except in the case where a new directory inherits a setgid bit  from
its parent directory.

Thus, when --perms and --executability are both disabled, rsync's behavior is the same as that of other file-copy utilities, such as
cp(1) and tar(1).

In summary: to give destination files (both old and new) the source permissions, use  --perms.   To  give  new  files  the  destina-
tion-default  permissions (while leaving existing files unchanged), make sure that the --perms option is off and use --chmod=ugo=rwX
(which ensures that all non-masked bits get enabled).  If you'd care to make this latter behavior easier to type, you could define a
popt  alias  for	it, such as putting this line in the file ~/.popt (the following defines the -Z option, and includes --no-g to use
the default group of the destination dir):

rsync alias -Z --no-p --no-g --chmod=ugo=rwX

You could then use this new option in a command such as this one:

rsync -avZ src/ dest/

(Caveat: make sure that -a does not follow -Z, or it will re-enable the two "--no-*" options mentioned above.)

The preservation of the destination's setgid bit on newly-created directories when --perms is off was added in rsync  2.6.7.   Older
rsync  versions erroneously preserved the three special permission bits for newly-created files when --perms was off, while overrid-
ing the destination's setgid bit setting on a newly-created directory.  Default ACL observance was added to the ACL patch for  rsync
2.6.7, so older (or non-ACL-enabled) rsyncs use the umask even if default ACLs are present.  (Keep in mind that it is the version of
the receiving rsync that affects these behaviors.)

-E, --executability
This option causes rsync to preserve the executability (or non-executability) of regular files when --perms is not enabled.  A regu-
lar  file  is  considered to be executable if at least one 'x' is turned on in its permissions.  When an existing destination file's
executability differs from that of the corresponding source file, rsync modifies the destination file's permissions as follows:

o      To make a file non-executable, rsync turns off all its 'x' permissions.

o      To make a file executable, rsync turns on each 'x' permission that has a corresponding 'r' permission enabled.

If --perms is enabled, this option is ignored.

-A, --acls
This option causes rsync to update the destination ACLs to be the same as the source ACLs.  The option also implies --perms.

The source and destination systems must have compatible ACL entries for this option to work properly.  See the  --fake-super  option
for a way to backup and restore ACLs that are not compatible.

-X, --xattrs
This option causes rsync to update the destination extended attributes to be the same as the source ones.

For  systems that support extended-attribute namespaces, a copy being done by a super-user copies all namespaces except system.*.  A
normal user only copies the user.* namespace.  To be able to backup and restore non-user	namespaces  as	a  normal  user,  see  the
--fake-super option.

Note that this option does not copy rsyncs special xattr values (e.g. those used by --fake-super) unless you repeat the option (e.g.
-XX).  This "copy all xattrs" mode cannot be used with --fake-super.

--chmod
This option tells rsync to apply one or more comma-separated "chmod" modes to the permission of the  files  in  the  transfer.   The
resulting  value	is  treated  as  though it were the permissions that the sending side supplied for the file, which means that this
option can seem to have no effect on existing files if --perms is not enabled.

In addition to the normal parsing rules specified in the chmod(1) manpage, you can specify an item  that	should	only  apply  to  a
directory  by prefixing it with a 'D', or specify an item that should only apply to a file by prefixing it with a 'F'.  For example,
the following will ensure that all directories get marked set-gid, that no files are other-writable, that both are user-writable and
group-writable, and that both have consistent executability across all bits:

--chmod=Dg+s,ug+w,Fo-w,+X

Using octal mode numbers is also allowed:

--chmod=D2775,F664

It is also legal to specify multiple --chmod options, as each additional option is just appended to the list of changes to make.

See the --perms and --executability options for how the resulting permission value can be applied to the files in the transfer.

-o, --owner
This option causes rsync to set the owner of the destination file to be the same as the source file, but only if the receiving rsync
is being run as the super-user (see also the --super and --fake-super options).  Without this option, the owner of new and/or trans-
ferred files are set to the invoking user on the receiving side.

The  preservation  of  ownership	will associate matching names by default, but may fall back to using the ID number in some circum-

-g, --group
This option causes rsync to set the group of the destination file to be the same as the source file.  If the  receiving  program	is
not running as the super-user (or if --no-super was specified), only groups that the invoking user on the receiving side is a member
of will be preserved.  Without this option, the group is set to the default group of the invoking user on the receiving side.

The preservation of group information will associate matching names by default, but may fall back to using the  ID  number  in  some

--devices
This  option  causes rsync to transfer character and block device files to the remote system to recreate these devices.  This option
has no effect if the receiving rsync is not run as the super-user (see also the --super and --fake-super options).

--specials
This option causes rsync to transfer special files such as named sockets and fifos.

-D     The -D option is equivalent to --devices --specials.

-t, --times
This tells rsync to transfer modification times along with the files and update them on the remote system.  Note that if this option
is  not  used, the optimization that excludes files that have not been modified cannot be effective; in other words, a missing -t or
-a will cause the next transfer to behave as if it used -I, causing all files to be updated (though rsync's delta-transfer algorithm
will make the update fairly efficient if the files haven't actually changed, you're much better off using -t).

-O, --omit-dir-times
This  tells  rsync to omit directories when it is preserving modification times (see --times).  If NFS is sharing the directories on
the receiving side, it is a good idea to use -O.	This option is inferred if you use --backup without --backup-dir.

This option also has the side-effect of avoiding early creation  of  directories	in  incremental  recursion  copies.   The  default
--inc-recursive  copying	normally  does an early-create pass of all the sub-directories in a parent directory in order for it to be
able to then set the modify time of the parent directory right away (without having to delay that until a bunch of recursive copying
has finished).  This early-create idiom is not necessary if directory modify times are not being preserved, so it is skipped.  Since
early-create directories don't have accurate mode, mtime, or ownership, the use of this option can help when someone wants to  avoid
these partially-finished directories.

This tells rsync to omit symlinks when it is preserving modification times (see --times).

--super
This  tells  the	receiving  side  to attempt super-user activities even if the receiving rsync wasn't run by the super-user.  These
activities include: preserving users via the --owner option, preserving all groups (not just the	current  user's  groups)  via  the
--groups	option, and copying devices via the --devices option.  This is useful for systems that allow such activities without being
the super-user, and also for ensuring that you will get errors if the receiving side isn't being run as the super-user.  To turn off
super-user activities, the super-user can use --no-super.

--fake-super
When  this  option  is  enabled,	rsync  simulates  super-user  activities by saving/restoring the privileged attributes via special
extended attributes that are attached to each file (as needed).  This includes the  file's  owner  and  group  (if  it  is  not  the
default),  the  file's  device  info (device & special files are created as empty text files), and any permission bits that we won't
allow to be set on the real file (e.g.  the real file gets u-s,g-s,o-t for safety) or that would limit the owner's access (since the
real  super-user	can  always  access/change a file, the files we create can always be accessed/changed by the creating user).  This
option also handles ACLs (if --acls was specified) and non-user extended attributes (if --xattrs was specified).

This is a good way to backup data without using a super-user, and to store ACLs from incompatible systems.

The --fake-super option only affects the side where the option is used.  To affect the remote side of a remote-shell connection, use
the --remote-option (-M) option:

rsync -av -M--fake-super /src/ host:/dest/

For  a local copy, this option affects both the source and the destination.  If you wish a local copy to enable this option just for
the destination files, specify -M--fake-super.  If you wish a local copy to enable this option just for the  source  files,  combine
--fake-super with -M--super.

This option is overridden by both --super and --no-super.

-S, --sparse
Try  to  handle  sparse  files efficiently so they take up less space on the destination.  Conflicts with --inplace because it's not
possible to overwrite data in a sparse fashion.

--preallocate
This tells the receiver to allocate each destination file to its eventual size before writing data to the file.  Rsync will only use
the real filesystem-level preallocation support provided by Linux's fallocate(2) system call or Cygwin's posix_fallocate(3), not the
slow glibc implementation that writes a zero byte into each block.

Without this option, larger files may not be entirely contiguous on the filesystem, but with this option rsync  will  probably  copy
more  slowly.   If  the  destination is not an extent-supporting filesystem (such as ext4, xfs, NTFS, etc.), this option may have no
positive effect at all.

-n, --dry-run
This makes rsync perform a trial run that doesn't make any changes (and produces mostly the same output as a real run).  It is  most
commonly used in combination with the -v, --verbose and/or -i, --itemize-changes options to see what an rsync command is going to do
before one actually runs it.

The output of --itemize-changes is supposed to be exactly the same on a dry run and  a  subsequent  real	run  (barring  intentional
trickery	and  system  call  failures);  if it isn't, that's a bug.  Other output should be mostly unchanged, but may differ in some
areas.  Notably, a dry run does not send the actual data for file transfers, so --progress has no effect, the "bytes  sent",  "bytes
received", "literal data", and "matched data" statistics are too small, and the "speedup" value is equivalent to a run where no file
transfers were needed.

-W, --whole-file
With this option rsync's delta-transfer algorithm is not used and the whole file is sent as-is instead.  The transfer may be  faster
if  this	option	is used when the bandwidth between the source and destination machines is higher than the bandwidth to disk (espe-
cially when the "disk" is actually a networked filesystem).  This is the default when both the source and destination are  specified
as local paths, but only if no batch-writing option is in effect.

-x, --one-file-system
This tells rsync to avoid crossing a filesystem boundary when recursing.	This does not limit the user's ability to specify items to
copy from multiple filesystems, just rsync's recursion through the hierarchy of each directory that the user specified, and also the
analogous recursion on the receiving side during deletion.  Also keep in mind that rsync treats a "bind" mount to the same device as
being on the same filesystem.

If this option is repeated, rsync omits all mount-point directories from the copy.  Otherwise, it includes  an  empty  directory	at
each  mount-point it encounters (using the attributes of the mounted directory because those of the underlying mount-point directory
are inaccessible).

treated like a mount-point.  Symlinks to non-directories are unaffected by this option.

--existing, --ignore-non-existing
This  tells  rsync  to skip creating files (including directories) that do not exist yet on the destination.  If this option is com-
bined with the --ignore-existing option, no files will be updated (which can be useful if all you want to do  is	delete	extraneous
files).

This  option  is	a  transfer rule, not an exclude, so it doesn't affect the data that goes into the file-lists, and thus it doesn't
affect deletions.  It just limits the files that the receiver requests to be transferred.

--ignore-existing
This tells rsync to skip updating files that already exist on the destination (this does not ignore existing directories, or nothing

This  option  is	a  transfer rule, not an exclude, so it doesn't affect the data that goes into the file-lists, and thus it doesn't
affect deletions.  It just limits the files that the receiver requests to be transferred.

This option can be useful for those doing backups using the --link-dest option when they need to continue  a  backup  run  that  got
interrupted.   Since  a --link-dest run is copied into a new directory hierarchy (when it is used properly), using --ignore existing
will ensure that the already-handled files don't get tweaked (which avoids a change in permissions on the hard-linked files).   This
does mean that this option is only looking at the existing files in the destination hierarchy itself.

--remove-source-files
This  tells  rsync to remove from the sending side the files (meaning non-directories) that are a part of the transfer and have been
successfully duplicated on the receiving side.

Note that you should only use this option on source files that are quiescent.  If you are using this to move files that show up in a
particular  directory  over  to  another host, make sure that the finished files get renamed into the source directory, not directly
written into it, so that rsync can't possibly transfer a file that is not yet fully written.  If you can't  first  write	the  files
into  a  different directory, you should use a naming idiom that lets rsync avoid transferring files that are not yet finished (e.g.
name the file "foo.new" when it is written, rename it to "foo" when it is done, and then use the option  --exclude='*.new'  for  the
rsync transfer).

Starting	with 3.1.0, rsync will skip the sender-side removal (and output an error) if the file's size or modify time has not stayed
unchanged.

--delete
This tells rsync to delete extraneous files from the receiving side (ones that aren't on the sending side), but only for the  direc-
tories  that  are  being synchronized.  You must have asked rsync to send the whole directory (e.g. "dir" or "dir/") without using a
wildcard for the directory's contents (e.g. "dir/*") since the wildcard is expanded by the shell and rsync thus gets  a  request	to
transfer	individual files, not the files' parent directory.  Files that are excluded from the transfer are also excluded from being
deleted unless you use the --delete-excluded option or mark the rules as only matching on the sending side (see the  include/exclude
modifiers in the FILTER RULES section).

Prior  to  rsync	2.6.7, this option would have no effect unless --recursive was enabled.  Beginning with 2.6.7, deletions will also
occur when --dirs (-d) is enabled, but only for directories whose contents are being copied.

This option can be dangerous if used incorrectly!  It is a very good idea to first try a run using the --dry-run option (-n) to  see
what files are going to be deleted.

If  the  sending side detects any I/O errors, then the deletion of any files at the destination will be automatically disabled. This
is to prevent temporary filesystem failures (such as NFS errors) on the sending side from causing a massive deletion of files on the
destination.  You can override this with the --ignore-errors option.

The  --delete option may be combined with one of the --delete-WHEN options without conflict, as well as --delete-excluded.  However,
if none of the --delete-WHEN options are specified, rsync will choose the --delete-during algorithm when talking to rsync  3.0.0	or

--delete-before
Request  that the file-deletions on the receiving side be done before the transfer starts.  See --delete (which is implied) for more
details on file-deletion.

Deleting before the transfer is helpful if the filesystem is tight for space and removing extraneous files would help  to  make  the
transfer	possible.  However, it does introduce a delay before the start of the transfer, and this delay might cause the transfer to
timeout (if --timeout was specified).  It also forces rsync to use the old, non-incremental recursion algorithm that requires  rsync
to scan all the files in the transfer into memory at once (see --recursive).

--delete-during, --del
Request  that the file-deletions on the receiving side be done incrementally as the transfer happens.  The per-directory delete scan
is done right before each directory is checked for updates, so it behaves like a more efficient --delete-before, including doing the
deletions  prior to any per-directory filter files being updated.  This option was first added in rsync version 2.6.4.  See --delete
(which is implied) for more details on file-deletion.

--delete-delay
Request that the file-deletions on the receiving side be computed during the transfer (like --delete-during), and then removed after
the  transfer  completes.   This	is  useful  when  combined  with  --delay-updates and/or --fuzzy, and is more efficient than using
--delete-after (but can behave differently, since --delete-after computes the deletions in a separate pass  after  all  updates  are
done).   If the number of removed files overflows an internal buffer, a temporary file will be created on the receiving side to hold
the names (it is removed while open, so you shouldn't see it during the transfer).  If the creation of  the  temporary  file  fails,
rsync  will try to fall back to using --delete-after (which it cannot do if --recursive is doing an incremental scan).  See --delete
(which is implied) for more details on file-deletion.

--delete-after
Request that the file-deletions on the receiving side be done after the transfer has completed.  This is useful if you  are  sending
new  per-directory  merge  files	as a part of the transfer and you want their exclusions to take effect for the delete phase of the
current transfer.  It also forces rsync to use the old, non-incremental recursion algorithm that requires  rsync	to  scan  all  the
files in the transfer into memory at once (see --recursive).  See --delete (which is implied) for more details on file-deletion.

--delete-excluded
In  addition to deleting the files on the receiving side that are not on the sending side, this tells rsync to also delete any files
on the receiving side that are excluded (see --exclude).	See the FILTER RULES section for  a  way  to  make  individual	exclusions
behave  this  way  on the receiver, and for a way to protect files from --delete-excluded.  See --delete (which is implied) for more
details on file-deletion.

--ignore-missing-args
When rsync is first processing the explicitly requested source files (e.g. command-line arguments or --files-from  entries),  it	is
normally an error if the file cannot be found.  This option suppresses that error, and does not try to transfer the file.  This does
not affect subsequent vanished-file errors if a file was initially found to be present and later is no longer there.

--delete-missing-args
This option takes the behavior of (the implied) --ignore-missing-args option a step farther:  each missing arg will become  a  dele-
tion  request of the corresponding destination file on the receiving side (should it exist).  If the destination file is a non-empty
directory, it will only be successfully deleted if --force or --delete are in effect.  Other than that, this option  is  independent
of any other type of delete processing.

The missing source files are represented by special file-list entries which display as a "*missing" entry in the --list-only output.

--ignore-errors
Tells --delete to go ahead and delete files even when there are I/O errors.

--force
This  option  tells  rsync  to  delete a non-empty directory when it is to be replaced by a non-directory.  This is only relevant if
deletions are not active (see --delete for details).

Note for older rsync versions: --force used to still be required when using --delete-after, and it used to be non-functional  unless
the --recursive option was also enabled.

--max-delete=NUM
This  tells  rsync  not  to delete more than NUM files or directories.  If that limit is exceeded, all further deletions are skipped
through the end of the transfer.	At the end, rsync outputs a warning (including a count of the skipped deletions) and exits with an
error code of 25 (unless some more important error condition also occurred).

Beginning  with  version	3.0.0,	you  may specify --max-delete=0 to be warned about any extraneous files in the destination without
removing any of them.  Older clients interpreted this as "unlimited", so if you don't know what version the client is, you  can  use
the  less  obvious  --max-delete=-1 as a backward-compatible way to specify that no deletions be allowed (though really old versions
didn't warn when the limit was exceeded).

--max-size=SIZE
This tells rsync to avoid transferring any file that is larger than the specified SIZE. The SIZE value can be suffixed with a string
to indicate a size multiplier, and may be a fractional value (e.g. "--max-size=1.5m").

This  option  is	a  transfer rule, not an exclude, so it doesn't affect the data that goes into the file-lists, and thus it doesn't
affect deletions.  It just limits the files that the receiver requests to be transferred.

The suffixes are as follows: "K" (or "KiB") is a kibibyte (1024), "M" (or "MiB") is a mebibyte (1024*1024), and "G" (or "GiB") is  a
gibibyte	(1024*1024*1024).   If	you want the multiplier to be 1000 instead of 1024, use "KB", "MB", or "GB".  (Note: lower-case is
also accepted for all values.)  Finally, if the suffix ends in either "+1" or "-1", the value will be offset  by	one  byte  in  the
indicated direction.

Examples: --max-size=1.5mb-1 is 1499999 bytes, and --max-size=2g+1 is 2147483649 bytes.

Note that rsync versions prior to 3.1.0 did not allow --max-size=0.

--min-size=SIZE
This  tells  rsync to avoid transferring any file that is smaller than the specified SIZE, which can help in not transferring small,
junk files.  See the --max-size option for a description of SIZE and other information.

Note that rsync versions prior to 3.1.0 did not allow --min-size=0.

-B, --block-size=BLOCKSIZE
This forces the block size used in rsync's delta-transfer algorithm to a fixed value.  It is normally selected based on the size	of
each file being updated.	See the technical report for details.

-e, --rsh=COMMAND
This option allows you to choose an alternative remote shell program to use for communication between the local and remote copies of
rsync. Typically, rsync is configured to use ssh by default, but you may prefer to use rsh on a local network.

If this option is used with [user@]host::module/path, then the remote shell COMMAND will be used to  run	an  rsync  daemon  on  the
remote  host,  and all data will be transmitted through that remote shell connection, rather than through a direct socket connection
to a running rsync daemon on the remote host.  See the section "USING RSYNC-DAEMON FEATURES VIA A REMOTE-SHELL CONNECTION" above.

Command-line arguments are permitted in COMMAND provided that COMMAND is presented to rsync as a single argument.  You must use spa-
ces (not tabs or other whitespace) to separate the command and args from each other, and you can use single- and/or double-quotes to
preserve spaces in an argument (but not backslashes).  Note that doubling a single-quote inside a single-quoted string gives  you  a
single-quote;  likewise  for  double-quotes (though you need to pay attention to which quotes your shell is parsing and which quotes
rsync is parsing).  Some examples:

-e 'ssh -p 2234'
-e 'ssh -o "ProxyCommand nohup ssh firewall nc -w1 %h %p"'

(Note that ssh users can alternately customize site-specific connect options in their .ssh/config file.)

You can also choose the remote shell program using the RSYNC_RSH environment variable, which accepts the same range of values as -e.

--rsync-path=PROGRAM
Use this to specify what program is to be run on the remote machine to start-up rsync.  Often used when rsync is not in the  default
remote-shell's  path  (e.g. --rsync-path=/usr/local/bin/rsync).  Note that PROGRAM is run with the help of a shell, so it can be any
program, script, or command sequence you'd care to run, so long as it does not corrupt the standard-in & standard-out that rsync	is
using to communicate.

One tricky example is to set a different default directory on the remote machine for use with the --relative option.  For instance:

rsync -avR --rsync-path="cd /a/b && rsync" host:c/d /e/

-M, --remote-option=OPTION
This option is used for more advanced situations where you want certain effects to be limited to one side of the transfer only.  For
instance, if you want to pass --log-file=FILE and --fake-super to the remote system, specify it like this:

rsync -av -M --log-file=foo -M--fake-super src/ dest/

If you want to have an option affect only the local side of a transfer when it normally affects both sides, send its negation to the
remote side.  Like this:

rsync -av -x -M--no-x src/ dest/

Be  cautious  using  this,  as  it is possible to toggle an option that will cause rsync to have a different idea about what data to
expect next over the socket, and that will make it fail in a cryptic fashion.

Note that it is best to use a separate --remote-option for each option you want to pass.	This makes your useage compatible with the
--protect-args  option.	If that option is off, any spaces in your remote options will be split by the remote shell unless you take
steps to protect them.

When performing a local transfer, the "local" side is the sender and the "remote" side is the receiver.

Note some versions of the popt option-parsing library have a bug in them that prevents you from using an adjacent arg with an  equal
in  it next to a short option letter (e.g. -M--log-file=/tmp/foo.  If this bug affects your version of popt, you can use the version
of popt that is included with rsync.

-C, --cvs-exclude
This is a useful shorthand for excluding a broad range of files that you often don't want to transfer between  systems.  It  uses  a
similar algorithm to CVS to determine if a file should be ignored.

The exclude list is initialized to exclude the following items (these initial items are marked as perishable -- see the FILTER RULES
section):

RCS SCCS CVS CVS.adm RCSLOG cvslog.* tags TAGS .make.state .nse_depinfo *~ #* .#* ,* _$* *$ *.old *.bak  *.BAK  *.orig  *.rej
.del-* *.a *.olb *.o *.obj *.so *.exe *.Z *.elc *.ln core .svn/ .git/ .hg/ .bzr/

then,  files  listed  in	a  $HOME/.cvsignore are added to the list and any files listed in the CVSIGNORE environment variable (all cvsignore names are delimited by whitespace). Finally, any file is ignored if it is in the same directory as a .cvsignore file and matches one of the patterns listed therein. Unlike rsync's filter/exclude files, these patterns are split on whitespace. See the cvs(1) manual for more information. If you're combining -C with your own --filter rules, you should note that these CVS excludes are appended at the end of your own rules, regardless of where the -C was placed on the command-line. This makes them a lower priority than any rules you specified explicitly. If you want to control where these CVS excludes get inserted into your filter rules, you should omit the -C as a com- mand-line option and use a combination of --filter=:C and --filter=-C (either on your command-line or by putting the ":C" and "-C" rules into a filter file with your other rules). The first option turns on the per-directory scanning for the .cvsignore file. The second option does a one-time import of the CVS excludes mentioned above. -f, --filter=RULE This option allows you to add rules to selectively exclude certain files from the list of files to be transferred. This is most use- ful in combination with a recursive transfer. You may use as many --filter options on the command line as you like to build up the list of files to exclude. If the filter con- tains whitespace, be sure to quote it so that the shell gives the rule to rsync as a single argument. The text below also mentions that you can use an underscore to replace the space that separates a rule from its arg. See the FILTER RULES section for detailed information on this option. -F The -F option is a shorthand for adding two --filter rules to your command. The first time it is used is a shorthand for this rule: --filter='dir-merge /.rsync-filter' This tells rsync to look for per-directory .rsync-filter files that have been sprinkled through the hierarchy and use their rules to filter the files in the transfer. If -F is repeated, it is a shorthand for this rule: --filter='exclude .rsync-filter' This filters out the .rsync-filter files themselves from the transfer. See the FILTER RULES section for detailed information on how these options work. --exclude=PATTERN This option is a simplified form of the --filter option that defaults to an exclude rule and does not allow the full rule-parsing syntax of normal filter rules. See the FILTER RULES section for detailed information on this option. --exclude-from=FILE This option is related to the --exclude option, but it specifies a FILE that contains exclude patterns (one per line). Blank lines in the file and lines starting with ';' or '#' are ignored. If FILE is -, the list will be read from standard input. --include=PATTERN This option is a simplified form of the --filter option that defaults to an include rule and does not allow the full rule-parsing syntax of normal filter rules. See the FILTER RULES section for detailed information on this option. --include-from=FILE This option is related to the --include option, but it specifies a FILE that contains include patterns (one per line). Blank lines in the file and lines starting with ';' or '#' are ignored. If FILE is -, the list will be read from standard input. --files-from=FILE Using this option allows you to specify the exact list of files to transfer (as read from the specified FILE or - for standard input). It also tweaks the default behavior of rsync to make transferring just the specified files and directories easier: o The --relative (-R) option is implied, which preserves the path information that is specified for each item in the file (use --no-relative or --no-R if you want to turn that off). o The --dirs (-d) option is implied, which will create directories specified in the list on the destination rather than noisily skipping them (use --no-dirs or --no-d if you want to turn that off). o The --archive (-a) option's behavior does not imply --recursive (-r), so specify it explicitly, if you want it. o These side-effects change the default state of rsync, so the position of the --files-from option on the command-line has no bearing on how other options are parsed (e.g. -a works the same before or after --files-from, as does --no-R and all other options). The filenames that are read from the FILE are all relative to the source dir -- any leading slashes are removed and no ".." refer- ences are allowed to go higher than the source dir. For example, take this command: rsync -a --files-from=/tmp/foo /usr remote:/backup If /tmp/foo contains the string "bin" (or even "/bin"), the /usr/bin directory will be created as /backup/bin on the remote host. If it contains "bin/" (note the trailing slash), the immediate contents of the directory would also be sent (without needing to be explicitly mentioned in the file -- this began in version 2.6.4). In both cases, if the -r option was enabled, that dir's entire hierarchy would also be transferred (keep in mind that -r needs to be specified explicitly with --files-from, since it is not implied by -a). Also note that the effect of the (enabled by default) --relative option is to duplicate only the path info that is read from the file -- it does not force the duplication of the source-spec path (/usr in this case). In addition, the --files-from file can be read from the remote host instead of the local host if you specify a "host:" in front of the file (the host must match one end of the transfer). As a short-cut, you can specify just a prefix of ":" to mean "use the remote end of the transfer". For example: rsync -a --files-from=:/path/file-list src:/ /tmp/copy This would copy all the files specified in the /path/file-list file that was located on the remote "src" host. If the --iconv and --protect-args options are specified and the --files-from filenames are being sent from one host to another, the filenames will be translated from the sending host's charset to the receiving host's charset. NOTE: sorting the list of files in the --files-from input helps rsync to be more efficient, as it will avoid re-visiting the path elements that are shared between adjacent entries. If the input is not sorted, some path elements (implied directories) may end up being scanned multiple times, and rsync will eventually unduplicate them after they get turned into file-list elements. -0, --from0 This tells rsync that the rules/filenames it reads from a file are terminated by a null ('') character, not a NL, CR, or CR+LF. This affects --exclude-from, --include-from, --files-from, and any merged files specified in a --filter rule. It does not affect --cvs-exclude (since all names read from a .cvsignore file are split on whitespace). -s, --protect-args This option sends all filenames and most options to the remote rsync without allowing the remote shell to interpret them. This means that spaces are not split in names, and any non-wildcard special characters are not translated (such as ~,$, ;, &, etc.).
Wildcards are expanded on the remote host by rsync (instead of the shell doing it).

If you use this option with --iconv, the args related to the remote side will also be translated from the local to the remote  char-
acter-set.  The translation happens before wild-cards are expanded.  See also the --files-from option.

You  may	also  control  this  option  via the RSYNC_PROTECT_ARGS environment variable.  If this variable has a non-zero value, this
option will be enabled by default, otherwise it will be disabled by default.  Either state is overridden	by  a  manually  specified
positive	or  negative version of this option (note that --no-s and --no-protect-args are the negative versions).  Since this option
was first introduced in 3.0.0, you'll need to make sure it's disabled if you ever need to interact with a remote rsync that is older
than that.

Rsync  can also be configured (at build time) to have this option enabled by default (with is overridden by both the environment and
the command-line).  This option will eventually become a new default setting at some as-yet-undetermined point in the future.

-T, --temp-dir=DIR
This option instructs rsync to use DIR as a scratch directory when creating temporary copies of the files transferred on the receiv-
ing  side.   The default behavior is to create each temporary file in the same directory as the associated destination file.  Begin-
ning with rsync 3.1.1, the temp-file names inside the specified DIR will not be prefixed with an extra dot (though they  will  still

This  option is most often used when the receiving disk partition does not have enough free space to hold a copy of the largest file
in the transfer.	In this case (i.e. when the scratch directory is on a different disk partition), rsync will not be able to  rename
each  received temporary file over the top of the associated destination file, but instead must copy it into place.  Rsync does this
by copying the file over the top of the destination file, which means that the destination file will contain truncated  data  during
this  copy.  If this were not done this way (even if the destination file were first removed, the data locally copied to a temporary
file in the destination directory, and then renamed into place) it would be possible for the old file to	continue  taking  up  disk
space (if someone had it open), and thus there might not be enough room to fit the new version on the disk at the same time.

If  you  are  using this option for reasons other than a shortage of disk space, you may wish to combine it with the --delay-updates
option, which will ensure that all copied files get put into subdirectories in the destination hierarchy, awaiting the  end  of  the
transfer.  If you don't have enough room to duplicate all the arriving files on the destination partition, another way to tell rsync
that you aren't overly concerned about disk space is to use the --partial-dir option with a relative path; because this tells  rsync
that  it	is  OK	to stash off a copy of a single file in a subdir in the destination hierarchy, rsync will use the partial-dir as a
staging area to bring over the copied file, and then rename it into place from there. (Specifying a --partial-dir with  an  absolute
path does not have this side-effect.)

-y, --fuzzy
This  option tells rsync that it should look for a basis file for any destination file that is missing.  The current algorithm looks
in the same directory as the destination file for either a file that has an identical size and modified-time, or	a  similarly-named
file.  If found, rsync uses the fuzzy basis file to try to speed up the transfer.

If the option is repeated, the fuzzy scan will also be done in any matching alternate destination directories that are specified via

Note that the use of the --delete option might get rid of any potential fuzzy-match files, so either use --delete-after  or  specify
some filename exclusions if you need to prevent this.

--compare-dest=DIR
This  option  instructs  rsync to use DIR on the destination machine as an additional hierarchy to compare destination files against
doing transfers (if the files are missing in the destination directory).	If a file is  found  in  DIR  that  is	identical  to  the
sender's	file,  the file will NOT be transferred to the destination directory.  This is useful for creating a sparse backup of just
files that have changed from an earlier backup.  This option is typically used to copy into an empty (or newly created) directory.

Beginning in version 2.6.4, multiple --compare-dest directories may be provided, which will cause rsync to search the  list  in  the
order  specified	for  an exact match.  If a match is found that differs only in attributes, a local copy is made and the attributes
updated.	If a match is not found, a basis file from one of the DIRs will be selected to try to speed up the transfer.

If DIR is a relative path, it is relative to the destination directory.  See also --copy-dest and --link-dest.

NOTE: beginning with version 3.1.0, rsync will remove a file from a non-empty destination hierarchy if an exact match  is  found	in
one of the compare-dest hierarchies (making the end result more closely match a fresh copy).

--copy-dest=DIR
This  option behaves like --compare-dest, but rsync will also copy unchanged files found in DIR to the destination directory using a
local copy.  This is useful for doing transfers to a new	destination  while  leaving  existing  files  intact,  and  then  doing  a
flash-cutover when all files have been successfully transferred.

Multiple	--copy-dest directories may be provided, which will cause rsync to search the list in the order specified for an unchanged
file.  If a match is not found, a basis file from one of the DIRs will be selected to try to speed up the transfer.

If DIR is a relative path, it is relative to the destination directory.  See also --compare-dest and --link-dest.

This option behaves like --copy-dest, but unchanged files are hard linked from DIR to the destination directory.	The files must	be
identical in all preserved attributes (e.g. permissions, possibly ownership) in order for the files to be linked together.  An exam-
ple:

rsync -av --link-dest=$PWD/prior_dir host:src_dir/ new_dir/ If file's aren't linking, double-check their attributes. Also check if some attributes are getting forced outside of rsync's con- trol, such a mount option that squishes root to a single user, or mounts a removable drive with generic ownership (such as OS X's "Ignore ownership on this volume" option). Beginning in version 2.6.4, multiple --link-dest directories may be provided, which will cause rsync to search the list in the order specified for an exact match. If a match is found that differs only in attributes, a local copy is made and the attributes updated. If a match is not found, a basis file from one of the DIRs will be selected to try to speed up the transfer. This option works best when copying into an empty destination hierarchy, as existing files may get their attributes tweaked, and that can affect alternate destination files via hard-links. Also, itemizing of changes can get a bit muddled. Note that prior to version 3.1.0, an alternate-directory exact match would never be found (nor linked into the destination) when a destination file already exists. Note that if you combine this option with --ignore-times, rsync will not link any files together because it only links identical files together as a substitute for transferring the file, never as an additional check after the file is updated. If DIR is a relative path, it is relative to the destination directory. See also --compare-dest and --copy-dest. Note that rsync versions prior to 2.6.1 had a bug that could prevent --link-dest from working properly for a non-super-user when -o was specified (or implied by -a). You can work-around this bug by avoiding the -o option when sending to an old rsync. -z, --compress With this option, rsync compresses the file data as it is sent to the destination machine, which reduces the amount of data being transmitted -- something that is useful over a slow connection. Note that this option typically achieves better compression ratios than can be achieved by using a compressing remote shell or a compressing transport because it takes advantage of the implicit information in the matching data blocks that are not explicitly sent over the connection. This matching-data compression comes at a cost of CPU, though, and can be disabled by repeating the -z option, but only if both sides are at least version 3.1.1. Note that if your version of rsync was compiled with an external zlib (instead of the zlib that comes packaged with rsync) then it will not support the old-style compression, only the new-style (repeated-option) compression. In the future this new-style compres- sion will likely become the default. The client rsync requests new-style compression on the server via the --new-compress option, so if you see that option rejected it means that the server is not new enough to support -zz. Rsync also accepts the --old-compress option for a future time when new-style compression becomes the default. See the --skip-compress option for the default list of file suffixes that will not be compressed. --compress-level=NUM Explicitly set the compression level to use (see --compress) instead of letting it default. Allowed values for NUM are between 0 and 9; default when --compress option is specified is 6. If NUM is non-zero, the --compress option is implied. --skip-compress=LIST Override the list of file suffixes that will not be compressed. The LIST should be one or more file suffixes (without the dot) sep- arated by slashes (/). You may specify an empty string to indicate that no file should be skipped. Simple character-class matching is supported: each must consist of a list of letters inside the square brackets (e.g. no special classes, such as "[:alpha:]", are supported, and '-' has no special meaning). The characters asterisk (*) and question-mark (?) have no special meaning. Here's an example that specifies 6 suffixes to skip (since 1 of the 5 rules matches 2 suffixes): --skip-compress=gz/jpg/mp[34]/7z/bz2 The default list of suffixes that will not be compressed is this (in this version of rsync): 7z ace avi bz2 deb gpg gz iso jpeg jpg lz lzma lzo mov mp3 mp4 ogg png rar rpm rzip tbz tgz tlz txz xz z zip This list will be replaced by your --skip-compress list in all but one situation: a copy from a daemon rsync will add your skipped suffixes to its list of non-compressing files (and its list may be configured to a different default). --numeric-ids With this option rsync will transfer numeric group and user IDs rather than using user and group names and mapping them at both ends. By default rsync will use the username and groupname to determine what ownership to give files. The special uid 0 and the special group 0 are never mapped via user/group names even if the --numeric-ids option is not specified. If a user or group has no name on the source system or it has no match on the destination system, then the numeric ID from the source system is used instead. See also the comments on the "use chroot" setting in the rsyncd.conf manpage for information on how the chroot setting affects rsync's ability to look up the names of the users and groups and what you can do about it. --usermap=STRING, --groupmap=STRING These options allow you to specify users and groups that should be mapped to other values by the receiving side. The STRING is one or more FROM:TO pairs of values separated by commas. Any matching FROM value from the sender is replaced with a TO value from the receiver. You may specify usernames or user IDs for the FROM and TO values, and the FROM value may also be a wild-card string, which will be matched against the sender's names (wild-cards do NOT match against ID numbers, though see below for why a '*' matches everything). You may instead specify a range of ID numbers via an inclusive range: LOW-HIGH. For example: --usermap=0-99:nobody,wayne:admin,*:normal --groupmap=usr:1,1:usr The first match in the list is the one that is used. You should specify all your user mappings using a single --usermap option, and/or all your group mappings using a single --groupmap option. Note that the sender's name for the 0 user and group are not transmitted to the receiver, so you should either match these values using a 0, or use the names in effect on the receiving side (typically "root"). All other FROM names match those in use on the sending side. All TO names match those in use on the receiving side. Any IDs that do not have a name on the sending side are treated as having an empty name for the purpose of matching. This allows them to be matched via a "*" or using an empty name. For instance: --usermap=:nobody --groupmap=*:nobody When the --numeric-ids option is used, the sender does not send any names, so all the IDs are treated as having an empty name. This means that you will need to specify numeric FROM values if you want to map these nameless IDs to different values. For the --usermap option to have any effect, the -o (--owner) option must be used (or implied), and the receiver will need to be running as a super-user (see also the --fake-super option). For the --groupmap option to have any effect, the -g (--groups) option must be used (or implied), and the receiver will need to have permissions to set that group. --chown=USER:GROUP This option forces all files to be owned by USER with group GROUP. This is a simpler interface than using --usermap and --groupmap directly, but it is implemented using those options internally, so you cannot mix them. If either the USER or GROUP is empty, no mapping for the omitted user/group will occur. If GROUP is empty, the trailing colon may be omitted, but if USER is empty, a lead- ing colon must be supplied. If you specify "--chown=foo:bar, this is exactly the same as specifying "--usermap=*:foo --groupmap=*:bar", only easier. --timeout=TIMEOUT This option allows you to set a maximum I/O timeout in seconds. If no data is transferred for the specified time then rsync will exit. The default is 0, which means no timeout. --contimeout This option allows you to set the amount of time that rsync will wait for its connection to an rsync daemon to succeed. If the timeout is reached, rsync exits with an error. --address By default rsync will bind to the wildcard address when connecting to an rsync daemon. The --address option allows you to specify a specific IP address (or hostname) to bind to. See also this option in the --daemon mode section. --port=PORT This specifies an alternate TCP port number to use rather than the default of 873. This is only needed if you are using the dou- ble-colon (::) syntax to connect with an rsync daemon (since the URL syntax has a way to specify the port as a part of the URL). See also this option in the --daemon mode section. --sockopts This option can provide endless fun for people who like to tune their systems to the utmost degree. You can set all sorts of socket options which may make transfers faster (or slower!). Read the man page for the setsockopt() system call for details on some of the options you may be able to set. By default no special socket options are set. This only affects direct socket connections to a remote rsync daemon. This option also exists in the --daemon mode section. --blocking-io This tells rsync to use blocking I/O when launching a remote shell transport. If the remote shell is either rsh or remsh, rsync defaults to using blocking I/O, otherwise it defaults to using non-blocking I/O. (Note that ssh prefers non-blocking I/O.) --outbuf=MODE This sets the output buffering mode. The mode can be None (aka Unbuffered), Line, or Block (aka Full). You may specify as little as a single letter for the mode, and use upper or lower case. The main use of this option is to change Full buffering to Line buffering when rsync's output is going to a file or pipe. -i, --itemize-changes Requests a simple itemized list of the changes that are being made to each file, including attribute changes. This is exactly the same as specifying --out-format='%i %n%L'. If you repeat the option, unchanged files will also be output, but only if the receiving rsync is at least version 2.6.7 (you can use -vv with older versions of rsync, but that also turns on the output of other verbose messages). The "%i" escape has a cryptic output that is 11 letters long. The general format is like the string YXcstpoguax, where Y is replaced by the type of update being done, X is replaced by the file-type, and the other letters represent attributes that may be output if they are being modified. The update types that replace the Y are as follows: o A < means that a file is being transferred to the remote host (sent). o A > means that a file is being transferred to the local host (received). o A c means that a local change/creation is occurring for the item (such as the creation of a directory or the changing of a symlink, etc.). o A h means that the item is a hard link to another item (requires --hard-links). o A . means that the item is not being updated (though it might have attributes that are being modified). o A * means that the rest of the itemized-output area contains a message (e.g. "deleting"). The file-types that replace the X are: f for a file, a d for a directory, an L for a symlink, a D for a device, and a S for a spe- cial file (e.g. named sockets and fifos). The other letters in the string above are the actual letters that will be output if the associated attribute for the item is being updated or a "." for no change. Three exceptions to this are: (1) a newly created item replaces each letter with a "+", (2) an identical item replaces the dots with spaces, and (3) an unknown attribute replaces each letter with a "?" (this can happen when talking to an older rsync). The attribute that is associated with each letter is as follows: o A c means either that a regular file has a different checksum (requires --checksum) or that a symlink, device, or special file has a changed value. Note that if you are sending files to an rsync prior to 3.0.1, this change flag will be present only for checksum-differing regular files. o A s means the size of a regular file is different and will be updated by the file transfer. o A t means the modification time is different and is being updated to the sender's value (requires --times). An alternate value of T means that the modification time will be set to the transfer time, which happens when a file/symlink/device is updated without --times and when a symlink is changed and the receiver can't set its time. (Note: when using an rsync 3.0.0 client, you might see the s flag combined with t instead of the proper T flag for this time-setting failure.) o A p means the permissions are different and are being updated to the sender's value (requires --perms). o An o means the owner is different and is being updated to the sender's value (requires --owner and super-user privileges). o A g means the group is different and is being updated to the sender's value (requires --group and the authority to set the group). o The u slot is reserved for future use. o The a means that the ACL information changed. o The x means that the extended attribute information changed. One other output is possible: when deleting files, the "%i" will output the string "*deleting" for each item that is being removed (assuming that you are talking to a recent enough rsync that it logs deletions instead of outputting them as a verbose message). --out-format=FORMAT This allows you to specify exactly what the rsync client outputs to the user on a per-update basis. The format is a text string containing embedded single-character escape sequences prefixed with a percent (%) character. A default format of "%n%L" is assumed if either --info=name or -v is specified (this tells you just the name of the file and, if the item is a link, where it points). For a full list of the possible escape characters, see the "log format" setting in the rsyncd.conf manpage. Specifying the --out-format option implies the --info=name option, which will mention each file, dir, etc. that gets updated in a significant way (a transferred file, a recreated symlink/device, or a touched directory). In addition, if the itemize-changes escape (%i) is included in the string (e.g. if the --itemize-changes option was used), the logging of names increases to mention any item that is changed in any way (as long as the receiving side is at least 2.6.4). See the --itemize-changes option for a descrip- tion of the output of "%i". Rsync will output the out-format string prior to a file's transfer unless one of the transfer-statistic escapes is requested, in which case the logging is done at the end of the file's transfer. When this late logging is in effect and --progress is also speci- fied, rsync will also output the name of the file being transferred prior to its progress information (followed, of course, by the out-format output). --log-file=FILE This option causes rsync to log what it is doing to a file. This is similar to the logging that a daemon does, but can be requested for the client side and/or the server side of a non-daemon transfer. If specified as a client option, transfer logging will be enabled with a default format of "%i %n%L". See the --log-file-format option if you wish to override this. Here's a example command that requests the remote side to log what is happening: rsync -av --remote-option=--log-file=/tmp/rlog src/ dest/ This is very useful if you need to debug why a connection is closing unexpectedly. --log-file-format=FORMAT This allows you to specify exactly what per-update logging is put into the file specified by the --log-file option (which must also be specified for this option to have any effect). If you specify an empty string, updated files will not be mentioned in the log file. For a list of the possible escape characters, see the "log format" setting in the rsyncd.conf manpage. The default FORMAT used if --log-file is specified and this option is not is '%i %n%L'. --stats This tells rsync to print a verbose set of statistics on the file transfer, allowing you to tell how effective rsync's delta-trans- fer algorithm is for your data. This option is equivalent to --info=stats2 if combined with 0 or 1 -v options, or --info=stats3 if combined with 2 or more -v options. The current statistics are as follows: o Number of files is the count of all "files" (in the generic sense), which includes directories, symlinks, etc. The total count will be followed by a list of counts by filetype (if the total is non-zero). For example: "(reg: 5, dir: 3, link: 2, dev: 1, special: 1)" lists the totals for regular files, directories, symlinks, devices, and special files. If any of value is 0, it is completely omitted from the list. o Number of created files is the count of how many "files" (generic sense) were created (as opposed to updated). The total count will be followed by a list of counts by filetype (if the total is non-zero). o Number of deleted files is the count of how many "files" (generic sense) were created (as opposed to updated). The total count will be followed by a list of counts by filetype (if the total is non-zero). Note that this line is only output if deletions are in effect, and only if protocol 31 is being used (the default for rsync 3.1.x). o Number of regular files transferred is the count of normal files that were updated via rsync's delta-transfer algorithm, which does not include dirs, symlinks, etc. Note that rsync 3.1.0 added the word "regular" into this heading. o Total file size is the total sum of all file sizes in the transfer. This does not count any size for directories or special files, but does include the size of symlinks. o Total transferred file size is the total sum of all files sizes for just the transferred files. o Literal data is how much unmatched file-update data we had to send to the receiver for it to recreate the updated files. o Matched data is how much data the receiver got locally when recreating the updated files. o File list size is how big the file-list data was when the sender sent it to the receiver. This is smaller than the in-memory size for the file list due to some compressing of duplicated data when rsync sends the list. o File list generation time is the number of seconds that the sender spent creating the file list. This requires a modern rsync on the sending side for this to be present. o File list transfer time is the number of seconds that the sender spent sending the file list to the receiver. o Total bytes sent is the count of all the bytes that rsync sent from the client side to the server side. o Total bytes received is the count of all non-message bytes that rsync received by the client side from the server side. "Non-message" bytes means that we don't count the bytes for a verbose message that the server sent to us, which makes the stats more consistent. -8, --8-bit-output This tells rsync to leave all high-bit characters unescaped in the output instead of trying to test them to see if they're valid in the current locale and escaping the invalid ones. All control characters (but never tabs) are always escaped, regardless of this option's setting. The escape idiom that started in 2.6.7 is to output a literal backslash () and a hash (#), followed by exactly 3 octal digits. For example, a newline would output as "#012". A literal backslash that is in a filename is not escaped unless it is followed by a hash and 3 digits (0-9). -h, --human-readable Output numbers in a more human-readable format. There are 3 possible levels: (1) output numbers with a separator between each set of 3 digits (either a comma or a period, depending on if the decimal point is represented by a period or a comma); (2) output num- bers in units of 1000 (with a character suffix for larger units -- see below); (3) output numbers in units of 1024. The default is human-readable level 1. Each -h option increases the level by one. You can take the level down to 0 (to output num- bers as pure digits) by specifing the --no-human-readable (--no-h) option. The unit letters that are appended in levels 2 and 3 are: K (kilo), M (mega), G (giga), or T (tera). For example, a 1234567-byte file would output as 1.23M in level-2 (assuming that a period is your local decimal point). Backward compatibility note: versions of rsync prior to 3.1.0 do not support human-readable level 1, and they default to level 0. Thus, specifying one or two -h options will behave in a comparable manner in old and new versions as long as you didn't specify a --no-h option prior to one or more -h options. See the --list-only option for one difference. --partial By default, rsync will delete any partially transferred file if the transfer is interrupted. In some circumstances it is more desir- able to keep partially transferred files. Using the --partial option tells rsync to keep the partial file which should make a subse- quent transfer of the rest of the file much faster. --partial-dir=DIR A better way to keep partial files than the --partial option is to specify a DIR that will be used to hold the partial data (instead of writing it out to the destination file). On the next transfer, rsync will use a file found in this dir as data to speed up the resumption of the transfer and then delete it after it has served its purpose. Note that if --whole-file is specified (or implied), any partial-dir file that is found for a file that is being updated will simply be removed (since rsync is sending files without using rsync's delta-transfer algorithm). Rsync will create the DIR if it is missing (just the last dir -- not the whole path). This makes it easy to use a relative path (such as "--partial-dir=.rsync-partial") to have rsync create the partial-directory in the destination file's directory when needed, and then remove it again when the partial file is deleted. If the partial-dir value is not an absolute path, rsync will add an exclude rule at the end of all your existing excludes. This will prevent the sending of any partial-dir files that may exist on the sending side, and will also prevent the untimely deletion of partial-dir items on the receiving side. An example: the above --partial-dir option would add the equivalent of "-f '-p .rsync-par- tial/'" at the end of any other filter rules. If you are supplying your own exclude rules, you may need to add your own exclude/hide/protect rule for the partial-dir because (1) the auto-added rule may be ineffective at the end of your other rules, or (2) you may wish to override rsync's exclude choice. For instance, if you want to make rsync clean-up any left-over partial-dirs that may be lying around, you should specify --delete-after and add a "risk" filter rule, e.g. -f 'R .rsync-partial/'. (Avoid using --delete-before or --delete-during unless you don't need rsync to use any of the left-over partial-dir data during the current run.) IMPORTANT: the --partial-dir should not be writable by other users or it is a security risk. E.g. AVOID "/tmp". You can also set the partial-dir value the RSYNC_PARTIAL_DIR environment variable. Setting this in the environment does not force --partial to be enabled, but rather it affects where partial files go when --partial is specified. For instance, instead of using --partial-dir=.rsync-tmp along with --progress, you could set RSYNC_PARTIAL_DIR=.rsync-tmp in your environment and then just use the -P option to turn on the use of the .rsync-tmp dir for partial transfers. The only times that the --partial option does not look for this environment value are (1) when --inplace was specified (since --inplace conflicts with --partial-dir), and (2) when --delay-updates was specified (see below). For the purposes of the daemon-config's "refuse options" setting, --partial-dir does not imply --partial. This is so that a refusal of the --partial option can be used to disallow the overwriting of destination files with a partial transfer, while still allowing the safer idiom provided by --partial-dir. --delay-updates This option puts the temporary file from each updated file into a holding directory until the end of the transfer, at which time all the files are renamed into place in rapid succession. This attempts to make the updating of the files a little more atomic. By default the files are placed into a directory named ".~tmp~" in each file's destination directory, but if you've specified the --partial-dir option, that directory will be used instead. See the comments in the --partial-dir section for a discussion of how this ".~tmp~" dir will be excluded from the transfer, and what you can do if you want rsync to cleanup old ".~tmp~" dirs that might be lying around. Conflicts with --inplace and --append. This option uses more memory on the receiving side (one bit per file transferred) and also requires enough free disk space on the receiving side to hold an additional copy of all the updated files. Note also that you should not use an absolute path to --par- tial-dir unless (1) there is no chance of any of the files in the transfer having the same name (since all the updated files will be put into a single directory if the path is absolute) and (2) there are no mount points in the hierarchy (since the delayed updates will fail if they can't be renamed into place). See also the "atomic-rsync" perl script in the "support" subdir for an update algorithm that is even more atomic (it uses --link-dest and a parallel hierarchy of files). -m, --prune-empty-dirs This option tells the receiving rsync to get rid of empty directories from the file-list, including nested directories that have no non-directory children. This is useful for avoiding the creation of a bunch of useless directories when the sending rsync is recur- sively scanning a hierarchy of files using include/exclude/filter rules. Note that the use of transfer rules, such as the --min-size option, does not affect what goes into the file list, and thus does not leave directories empty, even if none of the files in a directory match the transfer rule. Because the file-list is actually being pruned, this option also affects what directories get deleted when a delete is active. How- ever, keep in mind that excluded files and directories can prevent existing items from being deleted due to an exclude both hiding source files and protecting destination files. See the perishable filter-rule option for how to avoid this. You can prevent the pruning of certain empty directories from the file-list by using a global "protect" filter. For instance, this option would ensure that the directory "emptydir" was kept in the file-list: --filter 'protect emptydir/' Here's an example that copies all .pdf files in a hierarchy, only creating the necessary destination directories to hold the .pdf files, and ensures that any superfluous files and directories in the destination are removed (note the hide filter of non-directo- ries being used instead of an exclude): rsync -avm --del --include='*.pdf' -f 'hide,! */' src/ dest If you didn't want to remove superfluous destination files, the more time-honored options of "--include='*/' --exclude='*'" would work fine in place of the hide-filter (if that is more natural to you). --progress This option tells rsync to print information showing the progress of the transfer. This gives a bored user something to watch. With a modern rsync this is the same as specifying --info=flist2,name,progress, but any user-supplied settings for those info flags takes precedence (e.g. "--info=flist0 --progress"). While rsync is transferring a regular file, it updates a progress line that looks like this: 782448 63% 110.64kB/s 0:00:04 In this example, the receiver has reconstructed 782448 bytes or 63% of the sender's file, which is being reconstructed at a rate of 110.64 kilobytes per second, and the transfer will finish in 4 seconds if the current rate is maintained until the end. These statistics can be misleading if rsync's delta-transfer algorithm is in use. For example, if the sender's file consists of the basis file followed by additional data, the reported rate will probably drop dramatically when the receiver gets to the literal data, and the transfer will probably take much longer to finish than the receiver estimated as it was finishing the matched part of the file. When the file transfer finishes, rsync replaces the progress line with a summary line that looks like this: 1,238,099 100% 146.38kB/s 0:00:08 (xfr#5, to-chk=169/396) In this example, the file was 1,238,099 bytes long in total, the average rate of transfer for the whole file was 146.38 kilobytes per second over the 8 seconds that it took to complete, it was the 5th transfer of a regular file during the current rsync session, and there are 169 more files for the receiver to check (to see if they are up-to-date or not) remaining out of the 396 total files in the file-list. In an incremental recursion scan, rsync won't know the total number of files in the file-list until it reaches the ends of the scan, but since it starts to transfer files during the scan, it will display a line with the text "ir-chk" (for incremental recursion check) instead of "to-chk" until the point that it knows the full size of the list, at which point it will switch to using "to-chk". Thus, seeing "ir-chk" lets you know that the total count of files in the file list is still going to increase (and each time it does, the count of files left to check will increase by the number of the files added to the list). -P The -P option is equivalent to --partial --progress. Its purpose is to make it much easier to specify these two options for a long transfer that may be interrupted. There is also a --info=progress2 option that outputs statistics based on the whole transfer, rather than individual files. Use this flag without outputting a filename (e.g. avoid -v or specify --info=name0) if you want to see how the transfer is doing without scrolling the screen with a lot of names. (You don't need to specify the --progress option in order to use --info=progress2.) --password-file=FILE This option allows you to provide a password for accessing an rsync daemon via a file or via standard input if FILE is -. The file should contain just the password on the first line (all other lines are ignored). Rsync will exit with an error if FILE is world readable or if a root-run rsync command finds a non-root-owned file. This option does not supply a password to a remote shell transport such as ssh; to learn how to do that, consult the remote shell's documentation. When accessing an rsync daemon using a remote shell as the transport, this option only comes into effect after the remote shell finishes its authentication (i.e. if you have also specified a password in the daemon's config file). --list-only This option will cause the source files to be listed instead of transferred. This option is inferred if there is a single source arg and no destination specified, so its main uses are: (1) to turn a copy command that includes a destination arg into a file-list- ing command, or (2) to be able to specify more than one source arg (note: be sure to include the destination). Caution: keep in mind that a source arg with a wild-card is expanded by the shell into multiple args, so it is never safe to try to list such an arg without using this option. For example: rsync -av --list-only foo* dest/ Starting with rsync 3.1.0, the sizes output by --list-only are affected by the --human-readable option. By default they will con- tain digit separators, but higher levels of readability will output the sizes with unit suffixes. Note also that the column width for the size output has increased from 11 to 14 characters for all human-readable levels. Use --no-h if you want just digits in the sizes, and the old column width of 11 characters. Compatibility note: when requesting a remote listing of files from an rsync that is version 2.6.3 or older, you may encounter an error if you ask for a non-recursive listing. This is because a file listing implies the --dirs option w/o --recursive, and older rsyncs don't have that option. To avoid this problem, either specify the --no-dirs option (if you don't need to expand a direc- tory's content), or turn on recursion and exclude the content of subdirectories: -r --exclude='/*/*'. --bwlimit=RATE This option allows you to specify the maximum transfer rate for the data sent over the socket, specified in units per second. The RATE value can be suffixed with a string to indicate a size multiplier, and may be a fractional value (e.g. "--bwlimit=1.5m"). If no suffix is specified, the value will be assumed to be in units of 1024 bytes (as if "K" or "KiB" had been appended). See the --max-size option for a description of all the available suffixes. A value of zero specifies no limit. For backward-compatibility reasons, the rate limit will be rounded to the nearest KiB unit, so no rate smaller than 1024 bytes per second is possible. Rsync writes data over the socket in blocks, and this option both limits the size of the blocks that rsync writes, and tries to keep the average transfer rate at the requested limit. Some "burstiness" may be seen where rsync writes out a block of data and then sleeps to bring the average rate into compliance. Due to the internal buffering of data, the --progress option may not be an accurate reflection on how fast the data is being sent. This is because some files can show up as being rapidly sent when the data is quickly buffered, while other can show up as very slow when the flushing of the output buffer occurs. This may be fixed in a future version. --stop-at=y-m-dTh:m This option allows you to specify at what time to stop rsync, in year-month-dayThour:minute numeric format (e.g. 2004-12-31T23:59). You can specify a 2 or 4-digit year. You can also leave off various items and the result will be the next possible time that matches the specified data. For example, "1-30" specifies the next January 30th (at midnight), "04:00" specifies the next 4am, "1" specifies the next 1st of the month at midnight, and ":59" specifies the next 59th minute after the hour. If you prefer, you may separate the date numbers using slashes instead of dashes. --time-limit=MINS This option allows you to specify the maximum number of minutes rsync will run for. --write-batch=FILE Record a file that can later be applied to another identical destination with --read-batch. See the "BATCH MODE" section for details, and also the --only-write-batch option. --only-write-batch=FILE Works like --write-batch, except that no updates are made on the destination system when creating the batch. This lets you trans- port the changes to the destination system via some other means and then apply the changes via --read-batch. Note that you can feel free to write the batch directly to some portable media: if this media fills to capacity before the end of the transfer, you can just apply that partial transfer to the destination and repeat the whole process to get the rest of the changes (as long as you don't mind a partially updated destination system while the multi-update cycle is happening). Also note that you only save bandwidth when pushing changes to a remote system because this allows the batched data to be diverted from the sender into the batch file without having to flow over the wire to the receiver (when pulling, the sender is remote, and thus can't write the batch). --read-batch=FILE Apply all of the changes stored in FILE, a file previously generated by --write-batch. If FILE is -, the batch data will be read from standard input. See the "BATCH MODE" section for details. --protocol=NUM Force an older protocol version to be used. This is useful for creating a batch file that is compatible with an older version of rsync. For instance, if rsync 2.6.4 is being used with the --write-batch option, but rsync 2.6.3 is what will be used to run the --read-batch option, you should use "--protocol=28" when creating the batch file to force the older protocol version to be used in the batch file (assuming you can't upgrade the rsync on the reading system). --iconv=CONVERT_SPEC Rsync can convert filenames between character sets using this option. Using a CONVERT_SPEC of "." tells rsync to look up the default character-set via the locale setting. Alternately, you can fully specify what conversion to do by giving a local and a remote charset separated by a comma in the order --iconv=LOCAL,REMOTE, e.g. --iconv=utf8,iso88591. This order ensures that the option will stay the same whether you're pushing or pulling files. Finally, you can specify either --no-iconv or a CONVERT_SPEC of "-" to turn off any conversion. The default setting of this option is site-specific, and can also be affected via the RSYNC_ICONV environment variable. For a list of what charset names your local iconv library supports, you can run "iconv --list". If you specify the --protect-args option (-s), rsync will translate the filenames you specify on the command-line that are being sent to the remote host. See also the --files-from option. Note that rsync does not do any conversion of names in filter files (including include/exclude files). It is up to you to ensure that you're specifying matching rules that can match on both sides of the transfer. For instance, you can specify extra include/exclude rules if there are filename differences on the two sides that need to be accounted for. When you pass an --iconv option to an rsync daemon that allows it, the daemon uses the charset specified in its "charset" configura- tion parameter regardless of the remote charset you actually pass. Thus, you may feel free to specify just the local charset for a daemon transfer (e.g. --iconv=utf8). -4, --ipv4 or -6, --ipv6 Tells rsync to prefer IPv4/IPv6 when creating sockets. This only affects sockets that rsync has direct control over, such as the outgoing socket when directly contacting an rsync daemon. See also these options in the --daemon mode section. If rsync was complied without support for IPv6, the --ipv6 option will have no effect. The --version output will tell you if this is the case. --checksum-seed=NUM Set the checksum seed to the integer NUM. This 4 byte checksum seed is included in each block and MD4 file checksum calculation (the more modern MD5 file checksums don't use a seed). By default the checksum seed is generated by the server and defaults to the current time() . This option is used to set a specific checksum seed, which is useful for applications that want repeatable block checksums, or in the case where the user wants a more random checksum seed. Setting NUM to 0 causes rsync to use the default of time() for checksum seed. DAEMON OPTIONS The options allowed when starting an rsync daemon are as follows: --daemon This tells rsync that it is to run as a daemon. The daemon you start running may be accessed using an rsync client using the host::module or rsync://host/module/ syntax. If standard input is a socket then rsync will assume that it is being run via inetd, otherwise it will detach from the current ter- minal and become a background daemon. The daemon will read the config file (rsyncd.conf) on each connect made by a client and respond to requests accordingly. See the rsyncd.conf(5) man page for more details. --address By default rsync will bind to the wildcard address when run as a daemon with the --daemon option. The --address option allows you to specify a specific IP address (or hostname) to bind to. This makes virtual hosting possible in conjunction with the --config option. See also the "address" global option in the rsyncd.conf manpage. --bwlimit=RATE This option allows you to specify the maximum transfer rate for the data the daemon sends over the socket. The client can still specify a smaller --bwlimit value, but no larger value will be allowed. See the client version of this option (above) for some extra details. --config=FILE This specifies an alternate config file than the default. This is only relevant when --daemon is specified. The default is /etc/rsyncd.conf unless the daemon is running over a remote shell program and the remote user is not the super-user; in that case the default is rsyncd.conf in the current directory (typically$HOME).

-M, --dparam=OVERRIDE
This  option  can  be  used  to set a daemon-config parameter when starting up rsync in daemon mode.  It is equivalent to adding the
parameter at the end of the global settings prior to the first module's definition.  The parameter names can  be	specified  without
spaces, if you so desire.  For instance:

rsync --daemon -M pidfile=/path/rsync.pid

--no-detach
When running as a daemon, this option instructs rsync to not detach itself and become a background process.  This option is required
when running as a service on Cygwin, and may also be useful when rsync is supervised by a program such as daemontools or AIX's  Sys-
tem Resource Controller.	--no-detach is also recommended when rsync is run under a debugger.  This option has no effect if rsync is
run from inetd or sshd.

--port=PORT
This specifies an alternate TCP port number for the daemon to listen on rather than the default of 873.  See also the "port"  global
option in the rsyncd.conf manpage.

--log-file=FILE
This option tells the rsync daemon to use the given log-file name instead of using the "log file" setting in the config file.

--log-file-format=FORMAT
This  option tells the rsync daemon to use the given FORMAT string instead of using the "log format" setting in the config file.	It
also enables "transfer logging" unless the string is empty, in which case transfer logging is turned off.

--sockopts
This overrides the socket options setting in the rsyncd.conf file and has the same syntax.

-v, --verbose
This option increases the amount of information the daemon logs during its startup phase.  After the client connects,  the  daemon's
verbosity  level	will be controlled by the options that the client used and the "max verbosity" setting in the module's config sec-
tion.

-4, --ipv4 or -6, --ipv6
Tells rsync to prefer IPv4/IPv6 when creating the incoming sockets that the rsync daemon will use to listen for connections.  One of
these options may be required in older versions of Linux to work around an IPv6 bug in the kernel (if you see an "address already in
use" error when nothing else is using the port, try specifying --ipv6 or --ipv4 when starting the daemon).

If rsync was complied without support for IPv6, the --ipv6 option will have no effect.  The --version output will tell you  if  this
is the case.

-h, --help
When specified after --daemon, print a short help page describing the options available for starting an rsync daemon.

FILTER RULES
The  filter  rules  allow  for flexible selection of which files to transfer (include) and which files to skip (exclude).  The rules either
directly specify include/exclude patterns or they specify a way to acquire more include/exclude patterns (e.g. to read them from a file).

As the list of files/directories to transfer is built, rsync checks each name to be transferred against the list  of  include/exclude  pat-
terns  in  turn,  and  the first matching pattern is acted on:  if it is an exclude pattern, then that file is skipped; if it is an include
pattern then that filename is not skipped; if no matching pattern is found, then the filename is not skipped.

Rsync builds an ordered list of filter rules as specified on the command-line.  Filter rules have the following syntax:

RULE [PATTERN_OR_FILENAME]
RULE,MODIFIERS [PATTERN_OR_FILENAME]

You have your choice of using either short or long RULE names, as described below.  If you use a short-named rule, the ','  separating  the
RULE  from  the	MODIFIERS  is  optional.   The PATTERN or FILENAME that follows (when present) must come after either a single space or an
underscore (_).	Here are the available rule prefixes:

exclude, - specifies an exclude pattern.
include, + specifies an include pattern.
merge, . specifies a merge-file to read for more rules.
dir-merge, : specifies a per-directory merge-file.
hide, H specifies a pattern for hiding files from the transfer.
show, S files that match the pattern are not hidden.
protect, P specifies a pattern for protecting files from deletion.
risk, R files that match the pattern are not protected.
clear, ! clears the current include/exclude list (takes no arg)

When rules are being read from a file, empty lines are ignored, as are comment lines that start with a "#".

Note that the --include/--exclude command-line options do not allow the full range of rule parsing as described above --  they  only  allow
the specification of include/exclude patterns plus a "!" token to clear the list (and the normal comment parsing when rules are read from a
file).  If a pattern does not begin with "- " (dash, space) or "+ " (plus, space), then the rule will be interpreted as if  "+  "  (for	an
include	option)  or  "-  " (for an exclude option) were prefixed to the string.  A --filter option, on the other hand, must always contain
either a short or long rule name at the start of the rule.

Note also that the --filter, --include, and --exclude options take one rule/pattern each. To add multiple ones, you can repeat the  options
on the command-line, use the merge-file syntax of the --filter option, or the --include-from/--exclude-from options.

INCLUDE/EXCLUDE PATTERN RULES
You  can  include and exclude files by specifying patterns using the "+", "-", etc. filter rules (as introduced in the FILTER RULES section
above).	The include/exclude rules each specify a pattern that is matched against the names of the files that are going to be  transferred.
These patterns can take several forms:

o      if  the  pattern starts with a / then it is anchored to a particular spot in the hierarchy of files, otherwise it is matched against
the end of the pathname.	This is similar to a leading ^ in regular expressions.	Thus "/foo" would match a name of "foo" at  either
the  "root  of  the transfer" (for a global rule) or in the merge-file's directory (for a per-directory rule).  An unqualified "foo"
would match a name of "foo" anywhere in the tree because the algorithm is applied recursively from the top down; it  behaves  as	if
each  path  component  gets  a turn at being the end of the filename.  Even the unanchored "sub/foo" would match at any point in the
hierarchy where a "foo" was found within a directory named "sub".  See the section on ANCHORING INCLUDE/EXCLUDE PATTERNS for a  full
discussion of how to specify a pattern that matches at the root of the transfer.

o      if the pattern ends with a / then it will only match a directory, not a regular file, symlink, or device.

o      rsync chooses between doing a simple string match and wildcard matching by checking if the pattern contains one of these three wild-
card characters: '*', '?', and '[' .

o      a '*' matches any path component, but it stops at slashes.

o      use '**' to match anything, including slashes.

o      a '?' matches any character except a slash (/).

o      a '[' introduces a character class, such as [a-z] or [[:alpha:]].

o      in a wildcard pattern, a backslash can be used to escape a wildcard character, but it is matched literally  when	no  wildcards  are
present.	 This  means  that  there is an extra level of backslash removal when a pattern contains wildcard characters compared to a
pattern that has none.  e.g. if you add a wildcard to "fooar" (which matches the backslash) you would need to use  "foo\bar*"	to
avoid the "" becoming just "b".

o      if the pattern contains a / (not counting a trailing /) or a "**", then it is matched against the full pathname, including any lead-
ing directories. If the pattern doesn't contain a / or a "**", then it is matched only against the final component of the  filename.
(Remember  that  the  algorithm  is  applied  recursively so "full filename" can actually be any portion of a path from the starting
directory on down.)

o      a trailing "dir_name/***" will match both the directory (as if "dir_name/" had been specified) and everything in the  directory  (as
if "dir_name/**" had been specified).  This behavior was added in version 2.6.7.

Note  that, when using the --recursive (-r) option (which is implied by -a), every subcomponent of every path is visited from the top down,
so include/exclude patterns get applied recursively to each subcomponent's full name (e.g.  to  include	"/foo/bar/baz"	the  subcomponents
"/foo"  and  "/foo/bar"	must not be excluded).	The exclude patterns actually short-circuit the directory traversal stage when rsync finds
the files to send.  If a pattern excludes a particular parent directory, it can render a deeper include pattern ineffectual  because  rsync
did  not  descend  through  that  excluded  section  of the hierarchy.  This is particularly important when using a trailing '*' rule.  For
instance, this won't work:

+ /some/path/this-file-will-not-be-found
+ /file-is-included
- *

This fails because the parent directory "some" is excluded by the '*' rule, so rsync never visits  any  of  the	files  in  the	"some"	or
"some/path" directories.  One solution is to ask for all directories in the hierarchy to be included by using a single rule: "+ */" (put it
somewhere before the "- *" rule), and perhaps use the --prune-empty-dirs option.  Another solution is to add specific include rules for all
the parent dirs that need to be visited.  For instance, this set of rules works fine:

+ /some/
+ /some/path/
+ /some/path/this-file-is-found
+ /file-also-included
- *

Here are some examples of exclude/include matching:

o      "- *.o" would exclude all names matching *.o

o      "- /foo" would exclude a file (or directory) named foo in the transfer-root directory

o      "- foo/" would exclude any directory named foo

o      "- /foo/*/bar" would exclude any file named bar which is at two levels below a directory named foo in the transfer-root directory

o      "- /foo/**/bar" would exclude any file named bar two or more levels below a directory named foo in the transfer-root directory

o      The  combination	of  "+	*/",  "+  *.c",  and "- *" would include all directories and C source files but nothing else (see also the
--prune-empty-dirs option)

o      The combination of "+ foo/", "+ foo/bar.c", and "- *" would include only the foo directory and foo/bar.c (the foo directory must	be
explicitly included or it would be excluded by the "*")

The following modifiers are accepted after a "+" or "-":

o      A  /  specifies that the include/exclude rule should be matched against the absolute pathname of the current item.  For example, "-/
/etc/passwd" would exclude the passwd file any time the transfer was sending files from the "/etc" directory,  and  "-/  subdir/foo"
would always exclude "foo" when it is in a dir named "subdir", even if "foo" is at the root of the current transfer.

o      A  !  specifies  that the include/exclude should take effect if the pattern fails to match.  For instance, "-! */" would exclude all
non-directories.

o      A C is used to indicate that all the global CVS-exclude rules should be inserted as excludes in place of the "-C".   No  arg  should
follow.

o      An  s  is  used to indicate that the rule applies to the sending side.  When a rule affects the sending side, it prevents files from
being transferred.  The default is for a rule to affect both sides unless --delete-excluded was specified,  in  which  case  default
rules  become  sender-side  only.   See  also  the  hide	(H) and show (S) rules, which are an alternate way to specify sending-side
includes/excludes.

o      An r is used to indicate that the rule applies to the receiving side.  When a rule affects the receiving	side,  it  prevents  files
from  being  deleted.  See the s modifier for more info.	See also the protect (P) and risk (R) rules, which are an alternate way to

o      A p indicates that a rule is perishable, meaning that it is ignored in directories that are being deleted.   For	instance,  the	-C
option's	default rules that exclude things like "CVS" and "*.o" are marked as perishable, and will not prevent a directory that was
removed on the source from being deleted on the destination.

MERGE-FILE FILTER RULES
You can merge whole files into your filter rules by specifying either a merge (.) or a dir-merge (:) filter rule (as introduced in the FIL-
TER RULES section above).

There  are  two kinds of merged files -- single-instance ('.') and per-directory (':').	A single-instance merge file is read one time, and
its rules are incorporated into the filter list in the place of the "." rule.  For per-directory merge files, rsync will scan every  direc-
tory  that  it  traverses  for  the  named file, merging its contents when the file exists into the current list of inherited rules.  These
per-directory rule files must be created on the sending side because it is the sending side that is being scanned for the  available  files
to  transfer.   These  rule  files  may	also  need to be transferred to the receiving side if you want them to affect what files don't get
deleted (see PER-DIRECTORY RULES AND DELETE below).

Some examples:

merge /etc/rsync/default.rules
. /etc/rsync/default.rules
dir-merge .per-dir-filter
dir-merge,n- .non-inherited-per-dir-excludes
:n- .non-inherited-per-dir-excludes

The following modifiers are accepted after a merge or dir-merge rule:

o      A - specifies that the file should consist of only exclude patterns, with no other rule-parsing except for in-file comments.

o      A + specifies that the file should consist of only include patterns, with no other rule-parsing except for in-file comments.

o      A C is a way to specify that the file should be read in a CVS-compatible manner.	This turns on 'n', 'w', and '-', but  also  allows
the list-clearing token (!) to be specified.  If no filename is provided, ".cvsignore" is assumed.

o      A e will exclude the merge-file name from the transfer; e.g.  "dir-merge,e .rules" is like "dir-merge .rules" and "- .rules".

o      An n specifies that the rules are not inherited by subdirectories.

o      A  w  specifies  that  the  rules  are word-split on whitespace instead of the normal line-splitting.  This also turns off comments.
Note: the space that separates the prefix from the rule is treated specially, so "- foo + bar" is parsed as two rules (assuming that
prefix-parsing wasn't also disabled).

o      You may also specify any of the modifiers for the "+" or "-" rules (above) in order to have the rules that are read in from the file
default to having that modifier set (except for the ! modifier, which would not be useful).  For instance,  "merge,-/  .excl"  would
treat  the  contents of .excl as absolute-path excludes, while "dir-merge,s .filt" and ":sC" would each make all their per-directory
rules apply only on the sending side.  If the merge rule specifies sides to affect (via the s or r modifier or both), then the rules
in the file must not specify sides (via a modifier or a rule prefix such as hide).

Per-directory  rules  are inherited in all subdirectories of the directory where the merge-file was found unless the 'n' modifier was used.
Each subdirectory's rules are prefixed to the inherited per-directory rules from its parents, which gives the newest rules a higher  prior-
ity than the inherited rules.  The entire set of dir-merge rules are grouped together in the spot where the merge-file was specified, so it
is possible to override dir-merge rules via a rule that got specified earlier in the list of global rules.   When  the  list-clearing  rule
("!") is read from a per-directory file, it only clears the inherited rules for the current merge file.

Another	way to prevent a single rule from a dir-merge file from being inherited is to anchor it with a leading slash.  Anchored rules in a
per-directory merge-file are relative to the merge-file's directory, so a pattern "/foo" would only match the file "foo" in  the  directory
where the dir-merge filter file was found.

Here's an example filter file which you'd specify via --filter=". file":

merge /home/user/.global-filter
- *.gz
dir-merge .rules
+ *.[ch]
- *.o

This  will  merge  the  contents of the /home/user/.global-filter file at the start of the list and also turns the ".rules" filename into a
per-directory filter file.  All rules read in prior to the start of the directory scan follow the global anchoring rules  (i.e.	a  leading
slash matches at the root of the transfer).

If  a per-directory merge-file is specified with a path that is a parent directory of the first transfer directory, rsync will scan all the
parent dirs from that starting point to the transfer directory for the indicated per-directory file.  For instance, here is a common filter
(see -F):

--filter=': /.rsync-filter'

That rule tells rsync to scan for the file .rsync-filter in all directories from the root down through the parent directory of the transfer
prior to the start of the normal directory scan of the file in the directories that are sent as a part of  the  transfer.   (Note:  for	an
rsync daemon, the root is always the same as the module's "path".)

Some examples of this pre-scanning for per-directory files:

rsync -avF /src/path/ /dest/dir
rsync -av --filter=': ../../.rsync-filter' /src/path/ /dest/dir
rsync -av --filter=': .rsync-filter' /src/path/ /dest/dir

The  first  two	commands  above  will  look  for  ".rsync-filter"  in "/" and "/src" before the normal scan begins looking for the file in
"/src/path" and its subdirectories.  The last command avoids the parent-dir scan and only looks	for  the  ".rsync-filter"  files  in  each
directory that is a part of the transfer.

If  you	want  to  include  the contents of a ".cvsignore" in your patterns, you should use the rule ":C", which creates a dir-merge of the
.cvsignore file, but parsed in a CVS-compatible manner.	You can use this to affect where the --cvs-exclude (-C) option's inclusion of  the
per-directory  .cvsignore file gets placed into your rules by putting the ":C" wherever you like in your filter rules.  Without this, rsync
would add the dir-merge rule for the .cvsignore file at the end of all your other rules (giving it a lower priority than your  command-line
rules).	For example:

cat <<EOT | rsync -avC --filter='. -' a/ b
+ foo.o
:C
- *.old
EOT
rsync -avC --include=foo.o -f :C --exclude='*.old' a/ b

Both  of  the  above  rsync  commands  are identical.  Each one will merge all the per-directory .cvsignore rules in the middle of the list
rather than at the end.	This allows their dir-specific rules to supersede the rules that follow the :C instead of being subservient to all
your rules.  To affect the other CVS exclude rules (i.e. the default list of exclusions, the contents of $HOME/.cvsignore, and the value of$CVSIGNORE) you should omit the -C command-line option and instead insert a "-C" rule into your filter rules; e.g. "--filter=-C".

LIST-CLEARING FILTER RULE
You can clear the current include/exclude list by using the "!" filter rule (as introduced in the FILTER RULES section above).	The  "cur-
rent" list is either the global list of rules (if the rule is encountered while parsing the filter options) or a set of per-directory rules
(which are inherited in their own sub-list, so a subdirectory can use this to clear out the parent's rules).

ANCHORING INCLUDE/EXCLUDE PATTERNS
As mentioned earlier, global include/exclude patterns are anchored at the "root of the transfer" (as  opposed  to  per-directory  patterns,
which  are  anchored at the merge-file's directory).  If you think of the transfer as a subtree of names that are being sent from sender to
receiver, the transfer-root is where the tree starts to be duplicated in the destination directory.  This root governs where patterns  that

Because	the matching is relative to the transfer-root, changing the trailing slash on a source path or changing your use of the --relative
option affects the path you need to use in your matching (in addition to changing how much of the file tree is duplicated on  the  destina-
tion host).  The following examples demonstrate this.

Let's  say  that  we  want  to  match  two  source  files,  one	with  an  absolute  path  of  "/home/me/foo/bar",  and	one with a path of
"/home/you/bar/baz".  Here is how the various command choices differ for a 2-source transfer:

Example cmd: rsync -a /home/me /home/you /dest
+/- pattern: /me/foo/bar
+/- pattern: /you/bar/baz
Target file: /dest/me/foo/bar
Target file: /dest/you/bar/baz

Example cmd: rsync -a /home/me/ /home/you/ /dest
+/- pattern: /foo/bar		  (note missing "me")
+/- pattern: /bar/baz		  (note missing "you")
Target file: /dest/foo/bar
Target file: /dest/bar/baz

Example cmd: rsync -a --relative /home/me/ /home/you /dest
+/- pattern: /home/me/foo/bar	  (note full path)
+/- pattern: /home/you/bar/baz	  (ditto)
Target file: /dest/home/me/foo/bar
Target file: /dest/home/you/bar/baz

Example cmd: cd /home; rsync -a --relative me/foo you/ /dest
+/- pattern: /me/foo/bar	    (starts at specified path)
+/- pattern: /you/bar/baz     (ditto)
Target file: /dest/me/foo/bar
Target file: /dest/you/bar/baz

The easiest way to see what name you should filter is to just look at the output when using --verbose and put a / in front of the name (use
the --dry-run option if you're not yet ready to copy any files).

PER-DIRECTORY RULES AND DELETE
Without	a  delete option, per-directory rules are only relevant on the sending side, so you can feel free to exclude the merge files them-
selves without affecting the transfer.  To make this easy, the 'e' modifier adds this exclude for you, as seen in these two equivalent com-
mands:

rsync -av --filter=': .excl' --exclude=.excl host:src/dir /dest
rsync -av --filter=':e .excl' host:src/dir /dest

However, if you want to do a delete on the receiving side AND you want some files to be excluded from being deleted, you'll need to be sure
that the receiving side knows what files to exclude.  The easiest way is to include the per-directory merge files in the transfer  and  use
--delete-after,	because this ensures that the receiving side gets all the same exclude rules as the sending side before it tries to delete
anything:

rsync -avF --delete-after host:src/dir /dest

However, if the merge files are not a part of the transfer, you'll need to either specify some global exclude rules (i.e. specified on  the
command	line),	or  you'll  need  to  maintain	your own per-directory merge files on the receiving side.  An example of the first is this
(assume that the remote .rules files exclude themselves):

rsync -av --filter=': .rules' --filter='. /my/extra.rules'
--delete host:src/dir /dest

In the above example the extra.rules file can affect both sides of the transfer, but (on the sending side) the rules are subservient to the
rules merged from the .rules files because they were specified after the per-directory merge rule.

In  one	final  example,  the  remote side is excluding the .rsync-filter files from the transfer, but we want to use our own .rsync-filter
files to control what gets deleted on the receiving side.  To do this we must specifically exclude the per-directory merge files  (so  that
they don't get deleted) and then put rules into the local files to control what else should not get deleted.  Like one of these commands:

rsync -av --filter=':e /.rsync-filter' --delete
host:src/dir /dest
rsync -avFF --delete host:src/dir /dest

BATCH MODE
Batch  mode  can be used to apply the same set of updates to many identical systems. Suppose one has a tree which is replicated on a number
of hosts.  Now suppose some changes have been made to this source tree and those changes need to be propagated to the other hosts. In order
to  do  this using batch mode, rsync is run with the write-batch option to apply the changes made to the source tree to one of the destina-
tion trees.  The write-batch option causes the rsync client to store in a "batch file" all the information needed to repeat this  operation
against other, identical destination trees.

Generating  the	batch  file once saves having to perform the file status, checksum, and data block generation more than once when updating
multiple destination trees. Multicast transport protocols can be used to transfer the batch update files in parallel to many hosts at once,
instead of sending the same data to every host individually.

To  apply  the  recorded  changes  to another destination tree, run rsync with the read-batch option, specifying the name of the same batch
file, and the destination tree.	Rsync updates the destination tree using the information stored in the batch file.

For your convenience, a script file is also created when the write-batch option is used:  it will be named the same as the batch file  with
".sh"  appended.  This script file contains a command-line suitable for updating a destination tree using the associated batch file. It can
be executed using a Bourne (or Bourne-like) shell, optionally passing in an alternate destination tree pathname which is then used  instead
of  the	original  destination path.  This is useful when the destination tree path on the current host differs from the one used to create
the batch file.

Examples:

$rsync --write-batch=foo -a host:/source/dir/ /adest/dir/$ scp foo* remote:
$ssh remote ./foo.sh /bdest/dir/$ rsync --write-batch=foo -a /source/dir/ /adest/dir/
\$ ssh remote rsync --read-batch=- -a /bdest/dir/ <foo

In these examples, rsync is used to update /adest/dir/ from /source/dir/ and the information to repeat this operation is  stored  in  "foo"
and  "foo.sh".	The  host "remote" is then updated with the batched data going into the directory /bdest/dir.  The differences between the
two examples reveals some of the flexibility you have in how you deal with batches:

o      The first example shows that the initial copy doesn't have to be local -- you can push or pull data  to/from  a  remote  host  using
either the remote-shell syntax or rsync daemon syntax, as desired.

o      The  first  example  uses the created "foo.sh" file to get the right rsync options when running the read-batch command on the remote
host.

o      The second example reads the batch data via standard input so that the batch file doesn't need to be copied to  the  remote  machine
first.  This example avoids the foo.sh script because it needed to use a modified --read-batch option, but you could edit the script
file if you wished to make use of it  (just  be  sure  that  no  other  option  is  trying  to  use  standard  input,  such  as  the
"--exclude-from=-" option).

Caveats:

The  read-batch option expects the destination tree that it is updating to be identical to the destination tree that was used to create the
batch update fileset.  When a difference between the destination trees is encountered the update might be discarded with a warning (if  the
file appears to be up-to-date already) or the file-update may be attempted and then, if the file fails to verify, the update discarded with
an error.  This means that it should be safe to re-run a read-batch operation if the command got interrupted.  If you  wish  to	force  the
batched-update  to  always  be  attempted  regardless of the file's size and date, use the -I option (when reading the batch).  If an error
occurs, the destination tree will probably be in a partially updated state. In that case, rsync can be used in its regular (non-batch) mode
of operation to fix up the destination tree.

The  rsync  version  used  on  all destinations must be at least as new as the one used to generate the batch file.  Rsync will die with an
error if the protocol version in the batch file is too new for the batch-reading rsync to handle.  See also the --protocol option for a way
to  have  the  creating	rsync  generate a batch file that an older rsync can understand.  (Note that batch files changed format in version
2.6.3, so mixing versions older than that with newer versions will not work.)

When reading a batch file, rsync will force the value of certain options to match the data in the batch file if you didn't set them to  the
same  as  the  batch-writing  command.	Other  options	can  (and should) be changed.  For instance --write-batch changes to --read-batch,
--files-from is dropped, and the --filter/--include/--exclude options are not needed unless one of the --delete options is specified.

The code that creates the BATCH.sh file transforms any filter/include/exclude options into a single list that is appended as a "here" docu-
ment  to  the  shell script file.  An advanced user can use this to modify the exclude list if a change in what gets deleted by --delete is
desired.  A normal user can ignore this detail and just use the shell script as an easy way to run the appropriate --read-batch command for
the batched data.

The original batch mode in rsync was based on "rsync+", but the latest version uses a new implementation.

Three basic behaviors are possible when rsync encounters a symbolic link in the source directory.

By default, symbolic links are not transferred at all.  A message "skipping non-regular" file is emitted for any symlinks that exist.

If --links is specified, then symlinks are recreated with the same target on the destination.  Note that --archive implies --links.

Rsync  can  also  distinguish  "safe" and "unsafe" symbolic links.  An example where this might be used is a web site mirror that wishes to
ensure that the rsync module that is copied does not include symbolic links to /etc/passwd in  the  public  section  of	the  site.   Using
--copy-unsafe-links  will  cause any links to be copied as the file they point to on the destination.  Using --safe-links will cause unsafe
links to be omitted altogether.	(Note that you must specify --links for --safe-links to have any effect.)

ascend from the directory being copied.

Here's  a  summary of how the symlink options are interpreted.  The list is in order of precedence, so if your combination of options isn't
mentioned, use the first line that is a complete subset of your options:

Turn all symlinks into normal files (leaving no symlinks for any other options to affect).

Duplicate safe symlinks and skip unsafe ones.

DIAGNOSTICS
rsync occasionally produces error messages that may seem a little cryptic. The one that seems to cause the most confusion is "protocol ver-
sion mismatch -- is your shell clean?".

This  message  is  usually  caused  by your startup scripts or remote shell facility producing unwanted garbage on the stream that rsync is
using for its transport. The way to diagnose this problem is to run your remote shell like this:

ssh remotehost /bin/true > out.dat

then look at out.dat. If everything is working correctly then out.dat should be a zero length file. If you are getting the above error from
rsync  then  you will probably find that out.dat contains some text or data. Look at the contents and try to work out what is producing it.
The most common cause is incorrectly configured shell startup scripts (such as .cshrc or  .profile)  that  contain  output  statements  for

If  you	are  having trouble debugging filter patterns, then try specifying the -vv option.  At this level of verbosity rsync will show why
each individual file is included or excluded.

EXIT VALUES
0      Success

1      Syntax or usage error

2      Protocol incompatibility

3      Errors selecting input/output files, dirs

4      Requested action not supported: an attempt was made to manipulate 64-bit files on a platform that cannot support them; or an  option
was specified that is supported by the client and not by the server.

5      Error starting client-server protocol

6      Daemon unable to append to log-file

10     Error in socket I/O

11     Error in file I/O

12     Error in rsync protocol data stream

13     Errors with program diagnostics

14     Error in IPC code

21     Some error returned by waitpid()

22     Error allocating core memory buffers

23     Partial transfer due to error

24     Partial transfer due to vanished source files

25     The --max-delete limit stopped deletions

35     Timeout waiting for daemon connection

ENVIRONMENT VARIABLES
CVSIGNORE
The  CVSIGNORE  environment  variable  supplements  any  ignore  patterns in .cvsignore files. See the --cvs-exclude option for more
details.

RSYNC_ICONV
Specify a default --iconv setting using this environment variable. (First supported in 3.0.0.)

RSYNC_PROTECT_ARGS
Specify a non-zero numeric value if you want the --protect-args option to be enabled by default, or a zero value to make	sure  that
it is disabled by default. (First supported in 3.1.0.)

RSYNC_RSH
The  RSYNC_RSH  environment variable allows you to override the default shell used as the transport for rsync.  Command line options
are permitted after the command name, just as in the -e option.

RSYNC_PROXY
The RSYNC_PROXY environment variable allows you to redirect your rsync client to use a web proxy when connecting to a rsync  daemon.
You should set RSYNC_PROXY to a hostname:port pair.

Setting  RSYNC_PASSWORD  to  the required password allows you to run authenticated rsync connections to an rsync daemon without user
intervention. Note that this does not supply a password to a remote shell transport such as ssh; to learn how to	do  that,  consult
the remote shell's documentation.

USER or LOGNAME
The  USER  or  LOGNAME environment variables are used to determine the default username sent to an rsync daemon.	If neither is set,

HOME   The HOME environment variable is used to find the user's default .cvsignore file.

FILES
/etc/rsyncd.conf or rsyncd.conf

rsyncd.conf(5)

BUGS
times are transferred as *nix time_t values

When transferring to FAT filesystems rsync may re-sync unmodified files.  See the comments on the --modify-window option.

file permissions, devices, etc. are transferred as native numerical values

Please report bugs! See the web site at http://rsync.samba.org/

VERSION
This man page is current for version 3.1.2 of rsync.

INTERNAL OPTIONS
The options --server and --sender are used internally by rsync, and should never be typed by  a	user  under  normal  circumstances.   Some
awareness  of  these  options  may be needed in certain scenarios, such as when setting up a login that can only run an rsync command.  For
instance, the support directory of the rsync distribution has an example script named rrsync (for restricted rsync) that can be used with a

CREDITS

A  WEB  site is available at http://rsync.samba.org/.  The site includes an FAQ-O-Matic which may cover questions unanswered by this manual
page.

The primary ftp site for rsync is ftp://rsync.samba.org/pub/rsync.

We would be delighted to hear from you if you like this program.  Please contact the mailing-list at rsync@lists.samba.org.

This program uses the excellent zlib compression library written by Jean-loup Gailly and Mark Adler.

THANKS
Special thanks go out to: John Van Essen, Matt McCutchen, Wesley W. Terpstra, David Dykstra, Jos Backus, Sebastian  Krahmer,  Martin  Pool,
and our gone-but-not-forgotten compadre, J.W. Schultz.

Thanks  also to Richard Brent, Brendan Mackay, Bill Waite, Stephen Rothwell and David Bell.  I've probably missed some people, my apologies
if I have.

AUTHOR
rsync was originally written by Andrew Tridgell and Paul Mackerras.  Many people have later contributed to it.  It is currently	maintained
by Wayne Davison.

Mailing lists for support and development are available at http://lists.samba.org

21 Dec 2015 							  rsync(1)