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BanzaiMan/gist:7fceafa1819fb149ac0d7eb3d8137ebb

Last active August 25, 2016 17:12
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Why does this Perl one-liner does not drop the last dupe?
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gistfile1.txt
$ echo x:x:y:y:z:x:y:z | perl -e 'print join(":", grep { !$seen{$_}++ } split(/:/, scalar <>))'
x:y:z:z
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It is supposed to remove all duplicate entries in a :-delimited list while preserving the order in which unique components appear.

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