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Re: ''"$@" expansion


From: Chet Ramey
Subject: Re: ''"$@" expansion
Date: Wed, 27 Jul 2016 15:15:54 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:45.0) Gecko/20100101 Thunderbird/45.2.0

On 5/12/16 7:37 PM, Grisha Levit wrote:

> Thanks for the pointer. Looking at that interpretation
> (http://austingroupbugs.net/view.php?id=888), I noticed that it includes
> one case that bash is not handling correctly:
> 
>     If there are no positional parameters, the expansion of |@| shall
>     generate zero fields […] however, if the expansion is embedded within a
>     word which contains one or more other parts that expand to a quoted
>     null string, these null string(s) shall still produce an empty field […]
> 
> The provided example is:
> 
> |set -- printf '[%s]\n' foo ''"$@" *[foo] []* |
> 
> (Bash just prints |[foo]|).

Thanks for the report.  This will be fixed in bash-4.4.

> The attached exp9.sub and exp.right could be used for testing all the
> examples from the interpretation if desired. I removed the test cases that
> included undefined behavior.

Thanks, I'll take a look at adding it to the test suite.

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



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