in reply to Deleting duplicate lines from file

I think you're asking for the Unix tool uniq. There's a Pure Perl implementation included in the Perl Power Tools set (AKA "PPT"): uniq

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Re^2: Deleting duplicate lines from file
by jcc (Sexton) on Feb 16, 2006 at 21:17 UTC
    Probably... but remember that uniq removes consecutive dupes versus all dupes at any point. (not sure which the op was after) 
    $ cat afile
he
she
he
he
$ uniq afile
he
she
he

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