How about using 'Tie::File' module?? 
use strict;
use warnings;
use Tie::File;

my %seen;
tie my @file1, 'Tie::File', 'file.txt' or die;
tie my @file2, 'Tie::File', 'file2.txt' or die;

foreach (@file1) 
 { chomp; $seen{$_}++; }
 
for(@file2) {
    my $key = (split /\|/,$_)[1];
    print "$_\n" if $seen{$key};
}

untie(@file1);
untie(@file2);

[download]
output:

E|123|r|some|56|78|90
D|678|r|some|56|78|90
F|345|r|y|98|0|0

[download]

In reply to Re: Compare 2 files and create a new one if it matches by lamp
in thread Compare 2 files and create a new one if it matches by shawshankred

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