From mboxrd@z Thu Jan  1 00:00:00 1970
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	<2654c67a222037eb9da3e3400c305543@bellsouth.net>
Date: Sat,  3 Oct 2009 21:18:15 +0200
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From: hiro <23hiro@googlemail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
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Subject: Re: [9fans] mishandling empty lists - let's fix it
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> Nor do I. =C2=A0Having the no-argument case be filter behavior
> (stdin/stdout) is the most elegant, consistent, and predictable
> of the options I've seen.

Yeah, I always found the lone - very ugly!

If you do a fix you could also add --outputfile in order to improve
the readability :D