If you want to sort "numbers" instead of "strings" for the first level keys of the hash, then replace 
 foreach my $k1 (sort keys %hash){

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with 
 foreach my $k1 (sort {$a <=> $b} keys %hash){

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In reply to Re^3: How to sort Hashes of Hashes and print results in a file by gulden
in thread How to sort Hashes of Hashes and print results in a file by stan131

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