From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Thu, 17 Sep 2009 11:12:50 +0200
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From: Rudolf Sykora <rudolf.sykora@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
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Subject: Re: [9fans] awk help; not plan9 matter
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2009/9/17 matt <maht-9fans@maht0x0r.net>:
> awk '{a=$2; sub(a, "hell"); print}' file

The trouble with this is that the same string can appear more than
once (before, after the field, ...), so the simple substitution isn't
enough.
Ruda