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@sorted_keys = map { $_->[0] }
               sort { $a->[1] <=> $b->[1] }
...

print "$etcpw->{$_}\n"
   foreach @sorted_keys;

print "$etcpw->{$_->[0]}\n"
   foreach
      sort { $a->[1] <=> $b->[1] }
      map { $etcpw->{$_} =~ /:(\d+)/; [ $_, $1 ] }
      keys %{$etcpw};