Thanks for the replies everyone!

This is the code I eventually ended up with:

use strict;
use warnings;
use autodie;

my $input = 'D:/Some/Specific/Path/To/Input.CSV';
my $output = 'D:/Some/Specific/Path/To/Output.CSV';
open IN,$input;
binmode(IN);
open OUT,'>'.$output;
my $count = 0;

my @vk;
my %seen;

while (my $line = <IN>) {
    chomp $line;
    next if $. < 2;
    (undef, my $vk) = split ";" , $line;
    push (@vk,$vk) unless $seen{$vk}++;
}

close IN;

for my $vk (@vk) {
    if ($count != 10) {
        print OUT $vk.';';
        ++ $count;
    } else {
        print OUT "\n";
        $count = 0;
    }
}
close OUT;
exit 0;

[download]

Minimal amount of changes to my last version of the script and keeps it looking clean.

Have looked up quite a bit about filtering out double values but don't think I have come across that $seen{$vk}++ technique. Will definitely be able to use that more often, seems pretty easy to use and powerful when needing to do something like this.

In reply to Re: Removing doubles and printing only unique values by zarath
in thread Removing doubles and printing only unique values by zarath

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