Perl script for printing all old (SRC) RPM packages from a specified directory

oldrpm.pl

#!/usr/bin/env perl
# [2011-03-15] viliam.pucik@gmail.com
# Prints all old (SRC) RPM packages from specified directory.
# Assumed package format: name-version-release.distribution_optionalpatch.suffix.rpm
#
# Use case:
#
# $ ls test/
# glibc-2.12-1.7.el6_0.3.src.rpm  glibc-2.12-1.7.el6_0.4.src.rpm  glibc-2.12-1.7.el6.src.rpm
# $ ./oldrpm.pl test/
# glibc-2.12-1.7.el6.src.rpm glibc-2.12-1.7.el6_0.3.src.rpm

use strict;
use warnings;

if ( scalar @ARGV < 1 ) {
	print "usage: oldrpm.pl <dir>\n";
	exit 1;
}

opendir my $dh, $ARGV[0] or die $!;
my @rpms = grep { /\.rpm$/ } readdir $dh;
close $dh;

my %names;
map { /([\w\-\+]+)-[^-]+-[\d\.]+/, push @{ $names{$1} }, $_ } @rpms;

for ( sort keys %names ) {
	next if scalar @{ $names{$_} } < 2;
	my $pkg = my $version = my $release = my $patch = undef;
	for ( @{ $names{$_} } ) {
		/[\w\-\+]+-([^-]+)-([\d\.]+)[^_]+_([\d\.]+)/;
		my $_3 = ( defined $3 ) ? $3 : '';
		/[\w\-\+]+-([^-]+)-([\d\.]+)/;
		if ( !defined $pkg
                     || $version lt $1
                     || ( $version eq $1 && $release lt $2 )
                     || ( $version eq $1 && $release eq $2 && $patch lt $_3 ) ) {
			$pkg = $_;
			$version = $1;
			$release = $2;
			$patch = $_3;
		}
	}
	# commented alternative output
	#print "-"x20, "\n";
	for ( @{ $names{$_} } ) {
		#print; 
		#print " *" if ( $_ eq $pkg );
		#print "\n";
		print "$_ " if $_ ne $pkg;
	}
}