I have uploaded my code to my scratchpad, but obviously it doesn't work, that's why I'm here.

You mean this code?:

#!/usr/bin/perl -w

use strict;

my $infile = 'JPStream.csv';
my $outfile = 'new1.csv';

open IN, "< $infile" or die "Can't open $infile : $!";
open OUT, "> $outfile" or die "Can't open $outfile : $!";

my %seen;
my %seen2;
 
while (<IN>) {
     next if /^$/;
     chomp;
       if ( ! $seen2{$_} ) {
       print OUT "$_ Not in the last Traceroute ^\n";
       }
     last if /^$/;
     $seen{$_}++;
     %seen2 = ();
}

while (<IN>) {
     next if /^$/;
     chomp;
       if ( ! $seen{$_} ) {
       print OUT "$_ Not in the last Traceroute^^\n";
       }
     last if /^$/;
     $seen2{$_}++;
     %seen = ();
}
}
[download]

Why not post your code in the same node as your question? It certainly isn't due to length.

Please make it easier for us to help you help yourself.

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