10-14-2016
You're welcome,
-a means read into an array (when using
bash).
F is the name of the array
printf is the preferred and standardized alternative to
echo. The first field to
printf is the "format string" . "%s" means "string" and "\n" means new line". See:
printf or the bash man page.
To get all the element of the array one normally uses:
"${F[@]}"
"${F[@]# }" does the same, but in addition it uses
parameter expansion and
# means cut off a leading space if it exists.
Since
F is an array it will work on every element of the array (more about this in the bash man page).
With the while read loop, for every line of the input file, the array
F gets filled anew.
Last edited by Scrutinizer; 10-14-2016 at 05:34 AM..
This User Gave Thanks to Scrutinizer For This Post:
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LEARN ABOUT DEBIAN
bup-meta
bup-meta(1) General Commands Manual bup-meta(1)
NAME
bup-meta - create or extract a metadata archive
SYNOPSIS
bup meta --create
[-R] [-v] [-q] [--no-symlinks] [--no-paths] [-f file] <paths...>
bup meta --list
[-v] [-q] [-f file]
bup meta --extract
[-v] [-q] [--numeric-ids] [--no-symlinks] [-f file]
bup meta --start-extract
[-v] [-q] [--numeric-ids] [--no-symlinks] [-f file]
bup meta --finish-extract
[-v] [-q] [--numeric-ids] [-f file]
DESCRIPTION
bup meta either creates or extracts a metadata archive. A metadata archive contains the metadata information (timestamps, ownership,
access permissions, etc.)
for a set of filesystem paths.
OPTIONS
-c, --create
Create a metadata archive for the specified paths. Write the archive to standard output unless --file is specified.
-t, --list
Display information about the metadata in an archive. Read the archive from standard output unless --file is specified.
-x, --extract
Extract a metadata archive. Conceptually, perform --start-extract followed by --finish-extract. Read the archive from standard
input unless --file is specified.
--start-extract
Build a filesystem tree matching the paths stored in a metadata archive. By itself, this command does not produce a full restora-
tion of the metadata. For a full restoration, this command must be followed by a call to --finish-extract. Once this command has
finished, all of the normal files described by the metadata will exist and be empty. Restoring the data in those files, and then
calling --finish-extract should restore the original tree. The archive will be read from standard input unless --file is specified.
--finish-extract
Finish applying the metadata stored in an archive to the filesystem. Normally, this command should follow a call to --start-
extract. The archive will be read from standard input unless --file is specified.
-f, --file=filename
Read the metadata archive from filename or write it to filename as appropriate. If filename is "-", then read from standard input
or write to standard output.
-R, --recurse
Recursively descend into subdirectories during --create.
--numeric-ids
Apply numeric user and group IDs (rather than text IDs) during --extract or --finish-extract.
--symlinks
Record symbolic link targets when creating an archive, or restore symbolic links when extracting an archive (during --extract or
--start-extract). This option is enabled by default. Specify --no-symlinks to disable it.
--paths
Record pathnames when creating an archive. This option is enabled by default. Specify --no-paths to disable it.
-v, --verbose
Be more verbose (can be used more than once).
-q, --quiet
Be quiet.
EXAMPLES
# Create a metadata archive for /etc.
$ bup meta -cRf etc.meta /etc
bup: removing leading "/" from "/etc"
# Extract the etc.meta archive (files will be empty).
$ mkdir tmp && cd tmp
$ bup meta -xf ../etc.meta
$ ls
etc
# Restore /etc completely.
$ mkdir tmp && cd tmp
$ bup meta --start-extract -f ../etc.meta
...fill in all regular file contents using some other tool...
$ bup meta --finish-extract -f ../etc.meta
BUGS
Hard links are not handled yet.
BUP
Part of the bup(1) suite.
AUTHORS
Rob Browning <rlb@defaultvalue.org>.
Bup unknown- bup-meta(1)