Newsgroups: alt.sources.d
Path: utzoo!telly!problem!druid!darcy
From: darcy@druid.uucp (D'Arcy J.M. Cain)
Subject: Re: shell pipeline to reverse the order of lines.
Message-ID: <1991Feb28.134628.14432@druid.uucp>
Organization: D'Arcy Cain Consulting, West Hill, Ontario
References: <2166@m1.cs.man.ac.uk> <1991Feb26.025903.5850@NCoast.ORG> <1991Feb27.010612.25618@agate.berkeley.edu>
Date: Thu, 28 Feb 91 13:46:28 GMT

In article <1991Feb27.010612.25618@agate.berkeley.edu> Paul Vojta writes:
>In article <1991Feb26.025903.5850@NCoast.ORG> allbery@ncoast.ORG (Brandon S. Allbery KB8JRR) writes:
>>I don't understand what's wrong with
>>	nl | sort -nr | cut -f2-
>What's wrong with
>	tail -r

It isn't available on all systems.

I once wrote a C program to do this.  Here is the code slightly modified
to remove some extra processing I needed for that application.  Note that
long lines could be handled using malloc/realloc but this worked for my
purposes at the time and it was fast.  It also didn't take more than 5
minutes to write, even with the extra stuff I needed at the time.

/* flip.c */
#include	<stdio.h>
void	flip(void)
{
	char	entry[128];

	if (gets(entry))
	{
		flip();
		printf("%s\n", entry);
	}
}

int		main(void)
{
	flip();
	return(0);
}

-- 
D'Arcy J.M. Cain (darcy@druid)     |
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