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Re: quoted compound array assignment deprecated


From: Chet Ramey
Subject: Re: quoted compound array assignment deprecated
Date: Tue, 18 Aug 2015 10:51:46 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:38.0) Gecko/20100101 Thunderbird/38.0.1

On 8/17/15 4:19 AM, isabella parakiss wrote:
> Quoting is necessary in a few cases:
> 
> $ var=foo; declare -A "arr$var=([x]=y)"
> bash: warning: arrfoo=([x]=y): quoted compound array assignment deprecated
> $ var=foo; declare -A arr$var=([x]=y)
> bash: syntax error near unexpected token `('
> $ var=foo; declare -A "arr$var"=([x]=y)
> bash: syntax error near unexpected token `('
> 
> I don't think this should be the default behaiour...

This is exactly the case for which the warning is intended.  If you want
to construct variable names on the fly, use `eval' or don't mix
declarations of constructed variable names with compound assignment.

You can read the extensive discussion starting at
http://lists.gnu.org/archive/html/bug-bash/2014-12/msg00028.html.

http://lists.gnu.org/archive/html/bug-bash/2014-12/msg00115.html is the
newest proposal.

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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