Path: utzoo!attcan!uunet!husc6!yale!cs.utexas.edu!meyering
From: meyering@cs.utexas.edu (Jim Meyering)
Newsgroups: comp.editors
Subject: Re: sed address arithmetic
Message-ID: <914@ai.cs.utexas.edu>
Date: 22 Sep 90 16:33:27 GMT
References: <8738@neptune.inf.ethz.ch>
Distribution: comp
Organization: U of TX at Austin CS Dept
Lines: 19

In article <8738@neptune.inf.ethz.ch> reberhar@iiic.ethz.ch
(Rolf Georg Eberhardt) writes:

>Is it possible to do address arithmetic in sed?
> I would like to do something like
>
>/searchpattern/+3 s/^/<AA>/

Here's another solution (when reasonable, I prefer
to avoid sed's multiline commands: i,a,c...):
This is a bit ugly, though...

    % sed '/searchpattern/{N;N;p;g;N;s/^/<AA>/;}'

With at least SunOS4.0.3's /bin/sed, (due to a bug)
there must be a semicolon following the `s' command
at the end of a {} group.
-- 
Jim Meyering          meyering@cs.utexas.edu