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Full Discussion: Sftp large number of files
Top Forums Shell Programming and Scripting Sftp large number of files Post 302798961 by Corona688 on Thursday 25th of April 2013 12:37:43 PM
Old 04-25-2013
rsync, or 'remote sync', is an extremely common utility for duplicating entire trees of files. It is intelligent enough to avoid recopying up-to-date files while still copying ones that are out-of-date, corrupted, or missing. I've seen it used for managing hundreds of thousands of files in a go.

At its most basic, you give it a source directory and a destination directory, and it updates the contents of the destination to match the source. It has many options to control how it works. The manual page is a long read but useful.

Code:
$ mkdir a b
$ touch a/1 a/2 a/3 a/4
$ rsync a/ b  # Note a/, not a
$ ls b

1 2 3 4

$ rm a/1        # a now only contains 2 3 4
$ rsync -r a/ b # without --delete, does not delete extra files in b
$ ls b

1 2 3 4

$ rsync -r --delete a/ b # This will delete the extra file in b
$ ls b

2 3 4

$

If you run an rsync daemon on the destination, you can use rsync in a manner similar to scp: rsync /path/to/source/ user@host:/path/to/dest ...with the difference that rsync can be told to be recursive with -r, and is smarter than a blind copy.
Last edited by Corona688; 04-25-2013 at 01:46 PM..
 

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LEARN ABOUT DEBIAN

parallel-rsync

PARALLEL-RSYNC(1)														 PARALLEL-RSYNC(1)

NAME

       parallel-rsync - deploy files to listed hosts

SYNOPSIS

       parallel-rsync [OPTIONS] -h hosts.txt local remote

DESCRIPTION

       pssh provides a number of commands for executing against a group of computers, using SSH. It's most useful for operating on clusters of
       homogenously-configured hosts.

       parallel-rsync deploy files files to all hosts you listed.

OPTIONS

       -r --recursive
	   recusively copy directories (OPTIONAL)

       -a ----archive
	   use rsync -a (archive mode) (OPTIONAL)

       -z --compress
	   use rsync compression (OPTIONAL)

       -h --hosts
	   hosts file (each line "host[:port] [user]")

       -l --user
	   username (OPTIONAL)

       -p --par
	   max number of parallel threads (OPTIONAL)

       -o --outdir
	   output directory for stdout files (OPTIONAL)

       -e --errdir
	   output directory for stderr files (OPTIONAL)

       -t --timeout
	   timeout (secs) (-1 = no timeout) per host (OPTIONAL)

       -O --options
	   SSH options (OPTIONAL)

       -v --verbose
	   turn on warning and diagnostic messages (OPTIONAL)

EXAMPLE

	   # parallel-rsync -r -h hosts.txt -l irb2 foo /home/irb2/foo

ENVIRONMENT

       All four programs take similar sets of options. All of these options can be set using the following environment variables:

       o   PSSH_HOSTS
       o   PSSH_USER
       o   PSSH_PAR
       o   PSSH_OUTDIR
       o   PSSH_VERBOSE
       o   PSSH_OPTIONS

SEE ALSO

       parallel-ssh(1), parallel-scp(1), parallel-slurp(1), parallel-nuke(1), ssh(1), rsync(1)

AUTHOR

       Brent N. Chun <bnc@theether.org>

COPYING

       Copyright: 2003, 2004, 2005, 2006, 2007 Brent N. Chun

NOTES

	1. bnc@theether.org
	   mailto:bnc@theether.org

								    03/30/2009							 PARALLEL-RSYNC(1)
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