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Re: "typeset +x var" to a variable exported to a function doesn't remove


From: Chet Ramey
Subject: Re: "typeset +x var" to a variable exported to a function doesn't remove it from the environment.
Date: Sat, 06 Apr 2013 18:52:19 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:17.0) Gecko/20130307 Thunderbird/17.0.4

On 4/5/13 4:50 PM, Chet Ramey wrote:
> On 3/25/13 9:37 PM, Dan Douglas wrote:
>> Hello,
>>
>>     $ function f { typeset +x x; typeset x=123; echo "$x"; sh -c 'echo 
>> "$x"'; }; x=abc f
>>     123
>>     abc
>>     $ echo "$BASH_VERSION"
>>     4.2.45(1)-release
>>
>> This is inconsistent with a variable defined and exported any other way. 
>> (ksh93/mksh/zsh don't have this issue. Dash doesn't actually export the 
>> variable to the environment in this case, but just "localizes" it, and 
>> requires a separate export.)
> 
> The question is whether or not variables in the temporary environment
> passed to a shell function and that function's local variables exist in
> the same namespace.  Bash makes a distinction, to a certain extent,
> between the two, but it's inconsistent, as you say.  I'll take a look at
> this, and maybe it will be in bash-4.3.

I figured out how to make this work in a consistent way.  It turned out not
to be as bad as I had thought it might.

Chet

-- 
``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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