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Re: The correct way to use "for" without polluting the environment


From: Chet Ramey
Subject: Re: The correct way to use "for" without polluting the environment
Date: Mon, 09 Mar 2015 09:49:04 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:31.0) Gecko/20100101 Thunderbird/31.5.0

On 3/8/15 5:44 PM, Stephane Chazelas wrote:

> BTW, to get back on topic:
> 
> $ bash --norc -o posix
> bash-4.3$ unset zzz
> bash-4.3$ zzz=x eval
> bash-4.3$ env | grep zzz
> zzz=x
> 
> ksh93, zsh (in sh emulation), dash, mksh, the Bourne shell (the
> port of opensolaris' to Linux at least) do retain the value of
> zzz after eval has returned but don't export it to the
> environment. They don't export it within the evaled code either.
> 
> $ ksh -c 'zzz=x eval "env | grep zzz"'
> $
> 
> yash behaves like bash.
> 
> If I interpret the POSIX spec correctly, the variable should
> *not* be exported in those cases (though it's not very clear):

It's unspecified.

austingroupbugs.net/view.php?id=654

-- 
``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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