A little shorter: 

my @keys_to_print = (reverse sort keys %hash)[0 .. int(0.20 * (keys %h
+ash))-1];

foreach my $key (@keys_to_print) {
    print_to_file($key, $hash{$key});
}
sub print_to_file {
  # print to file
}

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In reply to Re^2: Selection of Hash key value pairs by arkturuz
in thread Selection of Hash key value pairs by Gavin

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