perl -E"say reverse sort{/(:\d+:)/<=>/(:\d+:)/}<>" /etc/passwd

It's quite possible that I'm being exceedingly dense, but how is this any different from just:

perl -E"say reverse<>" /etc/passwd

? Perhaps you meant

perl -E"say sort{($b=~/:(\d+)/)[0]<=>($a=~/:(\d+)/)[0]}<>" /etc/passwd

In reply to Re^2: Golf: reverse sort /etc/passwd by UID by thundergnat
in thread Golf: reverse sort /etc/passwd by UID by Tommy

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