Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!uunet!gistdev!dlp
From: dlp@gistdev.UUCP (Dirk Pellett)
Newsgroups: comp.unix.questions
Subject: Re: Reversing a file?
Message-ID: <816@gistdev.UUCP>
Date: 4 Oct 89 10:11:10 GMT
References: <MONTNARO.89Oct2224215@sprite.crd.ge.com> <1989Oct3.201759.19182@mrspoc.Transact.COM>
Organization: Global Information Systems Technology Inc., Savoy, IL
Lines: 20

>montnaro@sprite.crd.ge.com (Skip Montanaro) writes:
>>Does somebody have an elegant shell script for reversing the lines of a
>>file? I've come up with the following short one:

itkin@mrspoc.Transact.COM (Steven M. List) replies:
>This uses one of my all-time favorite VI/EX commands, and this is the
>first time I can remember anyone ASKING for it:
>	echo "g/./.m0\nw $OUTPUT\nq" | ex $INPUT
>the "g/./.m0" marks every line in the file and then moves each marked
>line to the beginning of the file (after line zero).

Actually, it marks all lines except blank lines.  What you really want is
the following:
        echo 'g/^/m0
        w
        q' | ed $1
That way you won't end up will a ton of blank lines at the end of your file.
-- 
-- 
Dirk Pellett			uunet!gistdev!dlp