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Full Discussion: Pipelining with tar
Top Forums UNIX for Dummies Questions & Answers Pipelining with tar Post 302460348 by huntreilly25 on Wednesday 6th of October 2010 01:54:44 PM
Old 10-06-2010
Pipelining with tar
Hello,
I am currently interning at a place and my job is to essentially learn UNIX. My supervisor gives me problems here and there to help guide me with my learning but for the most part I'm doing this all by self-teaching myself. Needless to say I have run into a few obstacles...for instance

-Create a *one* line command that, using tar, will collect the full /usr/local directory (you need to run this as root again) and copy the whole /usr/local structure under /opt
For example /usr/local/bin/hello will become /opt/local/bin/hello, etc.

I want this as follows:
1. /usr/local is collected by tar, but the output of this tar command is its stdout.
2. what you get from the previous stdout, you compress with gzip and send it to stdout again
3. get this output and decompress with gzip.
4. get this output and pipe to tar in a way that will extract the tree under /opt.

If anyone knows how I could go about doing this, please let me know, or at the very least point me in the right direction. What I've got so far (which could be completely wrong) is:

tar cvf - usr/local/ | gzip -c - | gunzip -c - | tar xvf -

in theory I feel like this should work (except for extracting the tree under /opt...i'm kinda stuck there) So if anyone knows or has a solution it would be greatly appreciated! and maybe help me out by explaining what is involve and maybe where I went wrong.

Thanks
 

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LEARN ABOUT SUSE

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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