Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!cica!tut.cis.ohio-state.edu!gem.mps.ohio-state.edu!uakari.primate.wisc.edu!aplcen!haven!adm!cmcl2!dasys1!jpr
From: jpr@dasys1.UUCP (Jean-Pierre Radley)
Newsgroups: comp.unix.questions
Subject: Re: Reversing a file?
Message-ID: <10915@dasys1.UUCP>
Date: 12 Oct 89 19:01:24 GMT
References: <MONTNARO.89Oct2224215@sprite.crd.ge.com>
Reply-To: jpr@dasys1.UUCP (Jean-Pierre Radley)
Organization: TANGENT
Lines: 17

In article <MONTNARO.89Oct2224215@sprite.crd.ge.com> <montanaro@crdgw1.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:


I don't think I made this up. Maybe I got it from Kernighan & Pike.
But it does seem simpler than the answers I've seen posted to date,
if you don't have 'tail -r', and if the file isn't too big (whatever that
may be, but at some point awk runs out of space).

<file awk '
	{ line[i++] = $0 }
END	{ while (i--) print line[i] }
'
-- 
Jean-Pierre Radley					      jpr@jpradley.uucp
New York, NY					      72160.1341@compuserve.com