GNU bug report logs - #12115
Please add tip about using tac to reverse a file byte-by-byte

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Package: coreutils;

Reported by: Reuben Thomas <rrt <at> sc3d.org>

Date: Wed, 1 Aug 2012 21:46:01 UTC

Severity: normal

Done: Paul Eggert <eggert <at> cs.ucla.edu>

Bug is archived. No further changes may be made.

Full log

Message #35 received at 12115 <at> debbugs.gnu.org (full text, mbox):

From: Eric Blake <eblake <at> redhat.com>
To: Andreas Schwab <schwab <at> linux-m68k.org>
Cc: "12115 <at> debbugs.gnu.org" <12115 <at> debbugs.gnu.org>,
	Jim Meyering <jim <at> meyering.net>, "Voelker,
	Bernhard" <bernhard.voelker <at> siemens-enterprise.com>,
	Reuben Thomas <rrt <at> sc3d.org>
Subject: Re: bug#12115: Please add tip about using tac to reverse a file
	byte-by-byte
Date: Thu, 02 Aug 2012 07:28:10 -0600

[Message part 1 (text/plain, inline)]
On 08/02/2012 07:18 AM, Andreas Schwab wrote:
>> For bash, one solution is:
>>
>> 	$ printf '\na\nb'|tac -rs '.\|'$(printf "\n")
> 
> No, command substitution strips trailing newlines.

So don't make it trailing:

printf '\na\nb'|tac -rs "$(printf '\n\\|.')"

-- 
Eric Blake   eblake <at> redhat.com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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This bug report was last modified 12 years and 114 days ago.

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