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Full Discussion: tar and untar the files using single line
Top Forums UNIX for Advanced & Expert Users tar and untar the files using single line Post 302520310 by bakunin on Friday 6th of May 2011 11:28:19 AM
Old 05-06-2011
Expanding on jim_mcnamara solution: you could use an intermediate file instead of a pipeline if you don't want to write the archived files immediately OR if you want to unarchive them to several places. Only in this case it makes sense to use compression because if you immediately restore the files to another place (regardless of this place being on the same system or not) it is easier to send the files uncompressed.

The pipeline in jim_mcnamaras code has - for the purpose of this thread - unlimited bandwidth, so it doesn't matter how much data you pipe through. It still does matter, though, to use one processore for compressing and another one for uncompressing the data.

The same is true for a network connection: network bandwidth is - in most instances, if not this would be a very rare exception - available in bigger quantities than processing time, therefore it is still cheaper to use

Code:
# tar -cf - /some/dir | ssh root@othermachine "cd /some/dir ; tar -xf -"

then to squeeze the stream through zip on one system and unzip on the other.

I case you still want to use compression:

Code:
archive and compress:
# (cd /some/dir ; tar -cf - . | gzip [-9] > /somewhere/file.tar.gz

uncompress and restore:
# gzip -cd /somewhere/file.tar.gz | (cd /some/dir; tar -xf - )

I hope this helps.

bakunin
 

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LEARN ABOUT DEBIAN

virt-tar-out

virt-tar-out(1) 					      Virtualization Support						   virt-tar-out(1)

NAME

       virt-tar-out - Pack a virtual machine disk image directory into a tarball.

SYNOPSIS

	virt-tar-out -a disk.img /dir files.tar

	virt-tar-out -d domain /dir files.tar

	virt-tar-out -d domain /dir - | gzip --best > files.tar.gz

DESCRIPTION

       "virt-tar-out" packs a virtual machine disk image directory into a tarball.

       The first parameter is the absolute path of the virtual machine directory.  The second parameter is the tar file to write.  Use "-" to
       write to standard output.

EXAMPLES

       Download the home directories from a guest:

	virt-tar-out -d MyGuest /home - | gzip --best > homes.tar.gz

JUST A SHELL SCRIPT WRAPPER AROUND GUESTFISH

       This command is just a simple shell script wrapper around the guestfish(1) "tar-out" command.  For anything more complex than a trivial
       copy, you are probably better off using guestfish directly.

OPTIONS

       Since the shell script just passes options straight to guestfish, read guestfish(1) to see the full list of options.

SEE ALSO

       guestfish(1), virt-cat(1), virt-copy-in(1), virt-copy-out(1), virt-edit(1), virt-tar-in(1), <http://libguestfs.org/>.

AUTHORS

       Richard W.M. Jones ("rjones at redhat dot com")

COPYRIGHT

       Copyright (C) 2011 Red Hat Inc.	<http://libguestfs.org/>

       This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by
       the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

       This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

       You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation,
       Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

libguestfs-1.18.1						    2013-12-07							   virt-tar-out(1)
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