GNU bug report logs - #15278
test: favor -a as binary op, with three arguments and !

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Message #8 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Chet Ramey <chet.ramey <at> case.edu>
To: Eric Blake <eblake <at> redhat.com>
Cc: chet.ramey <at> case.edu, bug-coreutils <at> gnu.org, bug-bash <at> gnu.org,
 kneufeld <at> gmail.com
Subject: Re: -a vs -e
Date: Thu, 05 Sep 2013 15:33:08 -0400

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On 9/5/13 12:45 PM, Eric Blake wrote:

> The POSIX wording states for 3-argument tests
> (http://pubs.opengroup.org/onlinepubs/9699919799/utilities/test.html):
> 
> ? If $2 is a binary primary, perform the binary test of $1 and $3.
> ? If $1 is ?!?, negate the two-argument test of $2 and $3.
> ? If $1 is ?(? and $3 is ?)?, perform the unary test of $2.
> 
> The first two bullets both apply to your situation, but it can be
> assumed that the ordering of the bullets is significant.  

Bash assumes that the order of the bullet points in the Posix description
of `test' implies prioritization.

- -- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
		 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU    chet <at> case.edu    http://cnswww.cns.cwru.edu/~chet/
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