The hash is sorted in a specific order,

That's impossible. Hashes can't be sorted, as you've noticed. Are you sure an AoA isn't more appropriate here? If you wish to continue using a hash, the typical solution it the sort the data as you read it from the hash, as follows: 

foreach my $key ( sort { ... } keys %lineFinal) {
   ...
}

[download]

Alternatively, you could use Tie::IxHash instead of a hash. You use it just like a normal hash (thanks to tie), but the contents are ordered.

In reply to Re: Cutting the top percentage out of a Hash by ikegami
in thread Cutting the top percentage out of a Hash by Gavin

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