From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Thu,  1 Oct 2009 09:38:45 +0100
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From: roger peppe <rogpeppe@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
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Subject: Re: [9fans] handling output
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2009/10/1 hugo rivera <uair00@gmail.com>:
> I've been wondering for a while if there's some way to multiplex (if
> this is the correct term) stdout for a given program:

that's what tee does.

e.g.
ls | tee >{grep regexp1 > file1} >{grep regexp2 > file2}