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From: Keith Owens <kaos@ocs.com.au>
Subject: Re: [SCRIPT] chomp: trim trailing whitespace
Date: Sun, 28 May 2006 18:33:14 +1000
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Jan Engelhardt (on Sat, 27 May 2006 14:42:02 +0200 (MEST)) wrote:
>And the CL form is
>  perl -i -pe '...'
>Somehow, you can't group it to -ipe, but who cares.

-i takes an optional extension which is used to optionally create
backup files.  As such, -i must be followed by space if you want no
extension (and no backup).