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Re: bang-hash behavior change?
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From: |
Chet Ramey |
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Subject: |
Re: bang-hash behavior change? |
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Date: |
Thu, 26 Feb 2015 12:24:01 -0500 |
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User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:31.0) Gecko/20100101 Thunderbird/31.5.0 |
On 2/25/15 7:40 PM, Milo H. Fields wrote:
> Greetings,
>
> I noticed that the ‘bang-hash’ behavior seems to have changed somewhere
> between bash version 4.1.17 and 4.3.33.
>
>
>
> e.g. for the script ‘jnk’ containing:
>
> echo "plain: !#"
> echo " parens: ${!#}"
It changed for Posix mode between bash-4.1 and bash-4.2, specifically in
mid-October 2010. According to Posix, ${!#} and ${!?} are discrete word
expansions (removing prefix pattern and displaying an error if unset,
respectively) involving the $! parameter.
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU chet@case.edu http://cnswww.cns.cwru.edu/~chet/