Hi zarath. $seen{$fields[1]} is always going to be false unless you set it to true. One possible way to do what you want is: 

(undef, my $vk) = split ";" , $line; # define input-lines
push (@vk,$vk) unless $seen{$vk}++;

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$seen{$vk}++ will first return the current value (ie 0 the first time), and then increment it by one, so the value will be true from that point. By the way, I also changed your split, you can affect the output of split directly to a list, with undef in the place of elements you want to ignore. And split will be optimized to stop splitting after the list is full (eg: here you only have two elements on the left, so it will only split twice).

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

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