my %unique;
foreach $d (@dllExeLines) {        
   if ($d =~ /\Q$serviceName/) {
      foreach $f (split(/,/, $d)) {
         if ($f =~ /\Q$dll/i) {
            $unique{lc($dll)} = $dll;
         }
      }
   }
}

my @unique = sort values %unique;
[download]