I thought that I was done, but no. Problem is, that I have ended up with a hash of arrays which contain duplicate values. I need to somehow process them, so that only unique key/value pair remains.

Example: 
foreach $file(@list_of_files) {
       open FILE, "$dir/$$file" || die "Can't open $dir/$file: $!\n";
       while ($lines = <FILE>) {
           chomp $lines;
           next if ($lines =~ /unknown|shutdown/);
           ($name, $ranks, $serial_numbers) = split(' ',$line);
           push @{$HoL{$name}}, $ranks;     
 }
   }

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My problem is that each file that I open contains some identical data. So, I wind up pushing duplicate key/value pairs into the hash of arrays. How can I avoid this, so I only end up with unique key/value pairs?

In reply to How to remove duplicate key/value pairs in hash of array by Tuna

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