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Re: "unset var" pops var off variable stack instead of unsetting it


From: Chet Ramey
Subject: Re: "unset var" pops var off variable stack instead of unsetting it
Date: Mon, 20 Mar 2017 14:47:17 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:45.0) Gecko/20100101 Thunderbird/45.8.0

On 3/20/17 2:30 PM, Eric Blake wrote:
> On 03/17/2017 07:21 PM, Stephane Chazelas wrote:
> 
>>> The problem is the non-obvious nature of unset's interaction with scope,
>>
>> the main problem to me is an unset command that doesn't unset.
>>
>> As shown in my original post, there's also a POSIX conformance
>> issue.
> 
> As POSIX has not yet specified 'local', any use of 'local' already
> renders the script non-conformant, so it shouldn't matter what bash does
> in that situation (although if POSIX is ever going to standardize
> 'local', it requires some concerted effort to make all shells with
> 'local' to settle on a lowest common denominator).

I believe he means the behavior of `a=0; a=1 eval unset a', which Posix
implicitly requires affect the global scope and results in a being unset
when the statement completes.

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

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