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Top Forums Shell Programming and Scripting Why do we use sort before compare ? Post 302257799 by otheus on Thursday 13th of November 2008 05:31:24 AM
Old 11-13-2008
What "compare" command are you referring to? Diff? comm? cmp?

As to why sort before compare, imagine you have two phone books: one from last year and one from this year. Could you simply compare the two books, line by line? Yes. Now imagine someone had taken one of the phonebooks, torn out each page and thrown all the pages around the house. Now how will you compare the two? First you would reorganize it so the torn-up phonebook was in its original order. Then you could compare line by line.

Does that help?
 

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CHDIST(1)																 CHDIST(1)

NAME
chdist - script to easily play with several distributions SYNOPSIS
chdist [options] [command] [command parameters] DESCRIPTION
chdist is a rewrite of what used to be known as 'MultiDistroTools' (or mdt). Its use is to create 'APT trees' for several distributions, making it easy to query the status of packages in other distribution without using chroots, for instance. OPTIONS
-h, --help Provide a usage message. -d, --data-dir DIR Choose data directory (default: $HOME/.chdist/). -a, --arch ARCH Choose architecture (default: `dpkg --print-architecture`). --version Display version information. COMMANDS
create DIST [URL RELEASE SECTIONS] Prepare a new tree named DIST apt-get DIST <update|source|...> Run apt-get inside DIST apt-cache DIST <show|showsrc|...> Run apt-cache inside DIST apt-rdepends DIST [...] Run apt-rdepends inside DIST src2bin DIST SRCPKG List binary packages for SRCPKG in DIST bin2src DIST BINPKG List source package for BINPKG in DIST compare-packages DIST1 DIST2 [DIST3, ...] compare-bin-packages DIST1 DIST2 [DIST3, ...] List versions of packages in several DISTributions compare-versions DIST1 DIST2 compare-bin-versions DIST1 DIST2 Same as compare-packages/compare-bin-packages, but also runs dpkg --compare-versions and display where the package is newer. compare-src-bin-packages DIST Compare sources and binaries for DIST compare-src-bin-versions DIST Same as compare-src-bin-packages, but also run dpkg --compare-versions and display where the package is newer grep-dctrl-packages DIST [...] Run grep-dctrl on *_Packages inside DIST grep-dctrl-sources DIST [...] Run grep-dctrl on *_Sources inside DIST list List available DISTs COPYRIGHT
This program is copyright 2007 by Lucas Nussbaum and Luk Claes. This program comes with ABSOLUTELY NO WARRANTY. It is licensed under the terms of the GPL, either version 2 of the License, or (at your option) any later version. Debian Utilities 2013-12-23 CHDIST(1)
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