You have opened both IN and OUT using the same mode. You probably mean: 
open IN,'<',$matchfile or die "Could not open $matchfile\n";
open OUT,'>>,$outfile or die "Could not open $outfile\n";

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Foreach syntax: foreach $var (@array)
For syntax: for (expression; condition; control)
I think you want to use two foreach commands here: 
foreach my $file (@files) {
  foreach my $file2 (<IN>) {

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In reply to Re: Need help with comparison code by GotToBTru
in thread Need help with comparison code by sowais

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