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LEARN ABOUT CENTOS

sort::versions

Versions(3)						User Contributed Perl Documentation					       Versions(3)

NAME

       Sort::Versions - a perl 5 module for sorting of revision-like numbers

SYNOPSIS

	       use Sort::Versions;
	       @l = sort { versioncmp($a, $b) } qw( 1.2 1.2.0 1.2a.0 1.2.a 1.a 02.a );

	       ...

	       use Sort::Versions;
	       print 'lower' if versioncmp('1.2', '1.2a') == -1;

	       ...

	       use Sort::Versions;
	       %h = (1 => 'd', 2 => 'c', 3 => 'b', 4 => 'a');
	       @h = sort { versioncmp($h{$a}, $h{$b}) } keys %h;

DESCRIPTION

       Sort::Versions allows easy sorting of mixed non-numeric and numeric strings, like the 'version numbers' that many shared library systems
       and revision control packages use. This is quite useful if you are trying to deal with shared libraries. It can also be applied to
       applications that intersperse variable-width numeric fields within text. Other applications can undoubtedly be found.

       For an explanation of the algorithm, it's simplest to look at these examples:

	 1.1   <  1.2
	 1.1a  <  1.2
	 1.1   <  1.1.1
	 1.1   <  1.1a
	 1.1.a <  1.1a
	 1     <  a
	 a     <  b
	 1     <  2
	 1.1-3 <  1.1-4
	 1.1-5 <  1.1.6

       More precisely (but less comprehensibly), the two strings are treated as subunits delimited by periods or hyphens. Each subunit can contain
       any number of groups of digits or non-digits. If digit groups are being compared on both sides, a numeric comparison is used, otherwise a
       ASCII ordering is used. A group or subgroup with more units will win if all comparisons are equal.  A period binds digit groups together
       more tightly than a hyphen.

       Some packages use a different style of version numbering: a simple real number written as a decimal. Sort::Versions has limited support for
       this style: when comparing two subunits which are both digit groups, if either subunit has a leading zero, then both are treated like
       digits after a decimal point. So for example:

	 0002  <  1
	 1.06  <  1.5

       This won't always work, because there won't always be a leading zero in real-number style version numbers. There is no way for
       Sort::Versions to know which style was intended. But a lot of the time it will do the right thing. If you are making up version numbers,
       the style with (possibly) more than one dot is the style to use.

USAGE

       The function "versioncmp()" takes two arguments and compares them like "cmp".  With perl 5.6 or later, you can also use this function
       directly in sorting:

	   @l = sort versioncmp qw(1.1 1.2 1.0.3);

       The function "versions()" can be used directly as a sort function even on perl 5.005 and earlier, but its use is deprecated.

AUTHOR

       Ed Avis <ed@membled.com> and Matt Johnson <mwj99@doc.ic.ac.uk> for recent releases; the original author is Kenneth J. Albanowski
       <kjahds@kjahds.com>.  Thanks to Hack Kampbjorn and Slaven Rezic for patches and bug reports.

       Copyright (c) 1996, Kenneth J. Albanowski. All rights reserved.	This program is free software; you can redistribute it and/or modify it
       under the same terms as Perl itself.

POD ERRORS

       Hey! The above document had some coding errors, which are explained below:

       Around line 141:
	   Non-ASCII character seen before =encoding in 'Kampbjorn'. Assuming UTF-8

perl v5.16.3							    2003-08-24							       Versions(3)

UNIX for Dummies Questions & Answers