I'd do something like this (untested):
#!/usr/bin/perl -w
use strict;
my %firstfile;
open IN_A, "<a.log" or die "$!\n";
while (<IN_A>) {
chomp;
$firstfile{$_}++;
}
close IN_A;
open IN_B, "<b.log" or die "$!\n";
while (<IN_B>) {
chomp;
print if exists($firstfile{$_});
}
close IN_B;
Cheers,
Darren :)
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