From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Thu, 17 Sep 2009 10:52:51 +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>:
> sed 's/^([^ ]+ +)([^ ]+)/\1HELL/'

Well, actually, my problem is a part of a more complicated script; I
don't know in advance neither the column nor what to put there.
I currently have this
awk '
	/TH/ {$'$pos'='$new'}
	{print}
' inpch
where 'TH' plays a role of a guard, and $pos and $new are the field to
be changed and with what, respectively.
I am afraid this rules out sed.

Thanks
Ruda