Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!udel!haven!adm!smoke!gwyn
From: gwyn@smoke.BRL.MIL (Doug Gwyn)
Newsgroups: comp.unix.questions
Subject: Re: A *real* difference
Message-ID: <13741@smoke.BRL.MIL>
Date: 5 Sep 90 04:06:00 GMT
References: <1990Sep4.045427.2307@ecn.purdue.edu> <4015@auspex.auspex.com> <29138@netnews.upenn.edu>
Organization: U.S. Army Ballistic Research Laboratory, APG, MD.
Lines: 8

In article <29138@netnews.upenn.edu> kehoe@scotty.dccs.upenn.edu (Brendan Kehoe) writes:
> I need to take two text files and show the differences between 'em. Nope,
>not just diff them. What I want to do is point out the *exact* differences
>on each line. ...

A program called "redline" does approximately what you want.
Its source was printed in the "Wizard's Grabbag" column in the
July 1988 issue of UNIX World.