You created a hash %file1, but then didn't use it as a hash

#       foreach my $key (sort keys %file1){
#                 foreach my $position1 (@{$file1{$key}}){
#            if ($current_line[0] eq $key) {

       if (exists $file1{current_line[0]} ) {
           $key= $current_line[0];
           foreach my $position1 (@{$file1{$key}}){

[download]

Both versions above should be equivalent (except for the sorting of the keys), but the second version removes a loop.

The conditions don't contribute much to the runtime, no need to optimize them

In reply to Re: Reading two files, cmp certain cols by jethro
in thread Reading two files, cmp certain cols by sesemin

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