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Re: [Help-bash] Unquoted $@ inside [[ ... ]]
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From: |
Chet Ramey |
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Subject: |
Re: [Help-bash] Unquoted $@ inside [[ ... ]] |
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Date: |
Sun, 20 Apr 2014 22:34:18 -0400 |
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User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 |
On 4/18/14, 4:21 PM, Greg Wooledge wrote:
> Someone in IRC had some code whose behavior I don't really understand.
> The code in question was:
>
> if [[ $@ == $','* ]]
>
> At first glance this looks like it's just equivalent to:
>
> if [[ $1 = ,* ]]
>
> But as it turns out, this is not the case.
It's a bug. There are slight differences in how bash expands unquoted $*
and $@ in different contexts. Try the attached patch for a proposed fix.
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/
dollar-at-star.patch
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