Re: Inconsistent arithmetic evaluation of parameters

From	Chet Ramey <chet.ramey@case.edu>
Newsgroups	gnu.bash.bug
Subject	Re: Inconsistent arithmetic evaluation of parameters
Date	2015-09-02 11:24 -0400
Message-ID	<mailman.402.1441207526.19560.bug-bash@gnu.org> (permalink)
References	(5 earlier) <87r3mhu91x.fsf@igel.home> <CANaoh6+s+GQCHozQpN_jO7SLHb=e+HQnCDivi+ADYz1gH6r=ow@mail.gmail.com> <mvmk2s9thoc.fsf@hawking.suse.de> <CANaoh6K2WBBv7EDbgeCBGe5tbBC_YfDW7x3ORgBVTdt2Ynfn7Q@mail.gmail.com> <20150902151948.GT4309@eeg.ccf.org>

Show all headers | View raw

On 9/2/15 11:19 AM, Greg Wooledge wrote:
> On Wed, Sep 02, 2015 at 10:16:14AM -0500, Dennis Williamson wrote:
>> The $ is implied.
> 
> That is completely absurd.  (And wrong.)

Not exactly.  When the arithmetic evaluator encounters a token that is of
the form of a shell identifier (`bar'), in a context where an operand is
needed, it treats it as a shell variable and looks up the variable's
value.  In that sense, it's an expansion.

The difference between bash and dash is what each shell does with that
value.

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

Back to gnu.bash.bug | Previous | Next | Find similar

Thread

Re: Inconsistent arithmetic evaluation of parameters Chet Ramey <chet.ramey@case.edu> - 2015-09-02 11:24 -0400

csiph-web