in reply to Golf: reverse sort /etc/passwd by UID
OK, using salva's wonderful Sort::Key, I can go five characters shorter...
perl -MSort::Key=rikeysort -e'print rikeysort{/(\d+)/;$1}<>' /etc/pass +wd
If you don't mind a spurious blank line at the end of the output, then it's easy to drop another two characters...
perl -MSort::Key=rikeysort -E'say rikeysort{/(\d+)/;$1}<>' /etc/passwd
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