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Full Discussion: tar command
Top Forums Shell Programming and Scripting tar command Post 302277818 by pludi on Sunday 18th of January 2009 08:40:44 AM
Old 01-18-2009
tar is short for Tape ARchiver. It's original purpose was to create tape archives, meaning a collection of files (uncompressed). Over time, people came to use it for archiving and compressing into files, since tar can write it's output to STDOUT, which can be piped into a compression program like compress or gzip.

GNU tar now includes an option to skip the shell piping and use gzip or bzip2 directly.
 

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APTITUDE-CREATE()														 APTITUDE-CREATE()

NAME
aptitude-create-state-bundle - bundle the current aptitude state SYNOPSIS
aptitude-create-state-bundle [<options>...] <output-file> DESCRIPTION
aptitude-create-state-bundle produces a compressed archive storing the files that are required to replicate the current package archive state. The following files and directories are included in the bundle: o $HOME/.aptitude o /var/lib/aptitude o /var/lib/apt o /var/cache/apt/*.bin o /etc/apt o /var/lib/dpkg/status The output of this program can be used as an argument to aptitude-run-state-bundle(1). OPTIONS
--force-bzip2 Override the autodetection of which compression algorithm to use. By default, aptitude-create-state-bundle uses bzip2(1) if it is available, and gzip(1) otherwise. Passing this option forces the use of bzip2 even if it doesn't appear to be available. --force-gzip Override the autodetection of which compression algorithm to use. By default, aptitude-create-state-bundle uses bzip2(1) if it is available, and gzip(1) otherwise. Passing this option forces the use of gzip even if bzip2 is available. --help Print a brief usage message, then exit. --print-inputs Instead of creating a bundle, display a list of the files and directories that the program would include if it generated a bundle. FILE FORMAT
The bundle file is simply a tar(1) file compressed with bzip2(1) or gzip(1), with each of the input directory trees rooted at ".". SEE ALSO
aptitude-run-state-bundle(1), aptitude(8), apt(8) AUTHOR
Daniel Burrows <dburrows@debian.org> Author. COPYRIGHT
Copyright 2007 Daniel Burrows. This manual page 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 manual page 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. APTITUDE-CREATE()
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