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Top Forums Shell Programming and Scripting Why do we use sort before compare ? Post 302257862 by otheus on Thursday 13th of November 2008 08:25:00 AM
Old 11-13-2008
Quote:
Originally Posted by yahyaaa
Yes you are right, but what if I rearrange the pages of my phone book in different order, I can still compare both of my phone books. Am I right ?
If you use the same ordering for both phone books. You could, for instance, sort with reverse (sort -r). Or you could sort by the second character and then the rest of the string (sort -k 1.2,1.3 -k 1,0)

Quote:
I hope that I made my point clearer...
Not really.
 

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LINUX-VERSION(1)					      General Commands Manual						  LINUX-VERSION(1)

NAME
linux-version - operate on Linux kernel version strings SYNOPSIS
linux-version compare VERSION1 OP VERSION2 linux-version sort [--reverse] [VERSION1 VERSION2 ...] linux-version list [--paths] DESCRIPTION
linux-version operates on Linux kernel version strings as reported by uname -r and used in file and directory names. These version strings do not follow the same rules as Debian package version strings and should not be compared as such or as arbitrary strings. compare VERSION1 OP VERSION2 Compare version strings, where OP is a binary operator. linux-version returns success (zero result) if the specified condition is satisfied, and failure (nonzero result) otherwise. The valid operators are: lt le eq ne ge gt sort [--reverse] [VERSION1 VERSION2 ...] Sort the given version strings and print them in order from lowest to highest. If the --reverse option is used, print them in order from highest to lowest. If no version strings are given as arguments, the version strings will instead be read from standard input, one per line. They may be suffixed by arbitrary text after a space, which will be included in the output. This means that, for example: linux-version list --paths | linux-version sort --reverse will list the installed versions and corresponding paths in order from highest to lowest version. list [--paths] List kernel versions installed in the customary location. If the --paths option, show the corresponding path for each version. AUTHOR
linux-version and this manual page were written by Ben Hutchings as part of the Debian linux-base package. 30 March 2011 LINUX-VERSION(1)
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