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From: Pietro Gagliardi <pietro10@mac.com>
Subject: Re: [9fans] Acme aborts on a pointless Edit command
Date: Sun, 23 Dec 2007 23:28:16 -0500
To: Fans of the OS Plan 9 from Bell Labs <9fans@cse.psu.edu>
Topicbox-Message-UUID: 21404910-ead3-11e9-9d60-3106f5b1d025

THE UNIX PROGRAMMING ENVIRONMENT by Kernighan and Pike to the rescue!  
According to Appendix A, to reverse lines,

	g/^/m0

Or, better yet, in rc:

	awk '
	{ x[NR] = $0}
	END {
		for (i = NR; i >= 1; i--)
			print x[i]
	}'

On Dec 23, 2007, at 11:17 PM, Anthony Martin wrote:

> I was feeling obscene and decided to test out stupid
> commands in sam and acme. Here's something I didn't
> expect.
>
> Sam:
> , x g/^/m.	no change to file
>
> Acme (Edit):
> , x g/^/m.	aborts in /sys/src/cmd/acme/ecmd.c:/^move
>
> It aborts because "move overlaps itself" but the
> question I have is, should it work like sam and
> do *visually* nothing at all?
>
>
> Anthony
>
> P.S.
> This came about because I was trying to find a way to
> move lines matching a certain pattern to the beginning
> of a file (like g/pattern/m0 in ed). Is there a nice
> way to do this in sam?
>
> Something that works like the ed command but leaves the
> lines in original order, not reversed, would be even
> better.
>
> -- 
> I spent a night with a blow-up girl and some LSD. -Freeheat