If you have TWO files, then you would do "++" on the first, and "--" on the second... 

use strict;
use warnings;
my $file1 = <<FILE1;
261293    'snow > equipment'
261293    'snow > equipment > boots'
261293    'snow > equipment > facemasks'
261293    'snow > equipment > goggles'
261293    'snow > equipment > helmets'
261293    'surf > accessories > books' 
FILE1

my $file2 = <<FILE2;
261293    'snow > equipment'
261293    'snow > equipment > boots'
261293    'snow > equipment > facemasks'
261293    'snow > equipment > goggles'
261293    'surf > accessories > books' 
FILE2

my %uniq;
$uniq{$_}++ for split /\n/, $file1;
$uniq{$_}-- for split /\n/, $file2;
print join "\n", grep { $uniq{$_} } keys %uniq;
print "\n";

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In reply to Re: ignore duplicates and show unique values between 2 text files by hdb
in thread ignore duplicates and show unique values between 2 text files by perlnoobster

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