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Re: shopt can't set extglob in a sub-shell?


From: Chet Ramey
Subject: Re: shopt can't set extglob in a sub-shell?
Date: Sun, 26 Feb 2012 17:59:13 -0500
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:8.0) Gecko/20111105 Thunderbird/8.0

On 2/26/12 6:06 AM, Dan Douglas wrote:

> I just tested a bunch of permutations. I was a bit surprised to see this one 
> fail:

You shouldn't have been.  The entire function definition, including the
additional embedded function definition, is parsed before any of it is
executed.

> 
> f()
>       if [[ $FUNCNAME != ${FUNCNAME[1]} ]]; then
>               trap 'shopt -u extglob' RETURN
>               shopt -s extglob
>               f
>       else
>               f()(
>                       shopt -s extglob
>                       echo !(x)
>               )
>               f
>       fi
> 
> f

-- 
``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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