grep PATTERN FILE_TO_SEARCH_IN > FILE_WITH_SEARCH_RESULTS

##</code><code>##

#!/usr/bin/perl
use strict;
use warnings;

my $pattern = shift @ARGV;

while (<>) {
	print if m/$pattern/;
}

##</code><code>##

perl script.pl PATTERN FILE_TO_SEARCH_IN > FILE_WITH_SEARCH_RESULTS