Of course it's probably going to be more efficient to get the sorting order to reverse than to physically reverse the sorted list after the sort. 

for ( sort { $b cmp $a } @keys ) { print "$_\n"; }

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Update: Oooh, that's good to know. Never mind me then.

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In reply to Re^2: sort/reverse strangeness by Fletch
in thread sort/reverse strangeness by ruzam

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