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Re: param expansion with single-character special vars in the environmen


From: Chet Ramey
Subject: Re: param expansion with single-character special vars in the environment
Date: Mon, 2 May 2016 16:07:57 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:45.0) Gecko/20100101 Thunderbird/45.0

On 5/2/16 4:01 PM, Dan Douglas wrote:
> On Mon, May 2, 2016 at 1:59 PM, Grisha Levit <address@hidden> wrote:
>>
>> On Mon, May 2, 2016 at 2:48 PM, Chet Ramey <address@hidden> wrote:
>>>
>>> and this one throws away the nameref attribute:
>>>
>>> typeset -n foo ; typeset -i foo ; foo=7*6 ; typeset -p foo
>>
>>
>> I think it's important to note that the nameref attribute is thrown away at
>> the `typeset -i foo' step, which makes some sense since `typeset -n -i' does
>> not seem to be valid in ksh.
> 
> ksh93 stores integer variables as actual integers internally so
> there's no opportunity for storing the expression, and the nameref
> attribute just wouldn't make sense.

I know.  I'm surprised there's no warning.

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



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