That is even easier. Just one regex.

use strict;
use warnings;
use lib "/Library/Perl/5.10.0/";
use autodie;

open FILE, "<", "data/04102013_loginlogs.txt" or die "Cannot open inpu
+t file.\n";
open OUT, ">>", "output.txt" or die "Cannot open output file.\n";

while( my $line=<FILE> ) { 
  print OUT $line if $line =~ /unknown type\(0x134e\)\s+30\.6511\s+\(V
+6\.5\.1 FP1\)/;
}

close OUT;
close FILE;
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