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From: morrell@hpsal2.HP.COM (Michael Morrell)
Newsgroups: comp.text
Subject: Re: Change bars in *roff
Message-ID: <2610030@hpsal2.HP.COM>
Date: 19 Sep 89 17:44:01 GMT
References: <9262@blia.BLI.COM>
Organization: HP System Architecture Lab, Cupertino
Lines: 18

/ hpsal2:comp.text / yost@esquire.UUCP (David A. Yost) / 12:42 pm  Sep 18, 1989 /
In article <888@paperboy.OSF.ORG> flowers@osf.org (Ken Flowers) writes:
>UNIX has a very simple tool for doing this that is
>available on most machines:
>
>    diffmk old.file new.file chbar.file

Beware diffmk.
1.  It runs ed, and ed (still) has some annoying hard limits that
    you can exceed, causing bizarre results.
----------

One other thing to watch out for because diffmk uses ed.  Any line in the
troff input which consists only of a "." (not uncommon in troff files), might
confuse the output since a period is also used by ed to signify the end of
a changed or appended section.

  Michael Morrell