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Re: ${parameter+word} not documented in bash.info or bash(1)
From: |
Chet Ramey |
Subject: |
Re: ${parameter+word} not documented in bash.info or bash(1) |
Date: |
Thu, 08 Jan 2009 11:43:45 -0500 |
User-agent: |
Thunderbird 2.0.0.19 (Macintosh/20081209) |
Martin Schwenke wrote:
> I'm running bash 3.2.39(1)-release (under Ubuntu 8.04 (Hardy)
> GNU/Linux). Neither bash.info or bash(1) documents parameter
> expansion of the form:
>
> ${parameter+word}
>
> This is different to ${parameter:+word}, is clearly implemented by
> bash and is documented in the standard (The Open Group Base
> Specifications Issue 6, IEEE Std 1003.1, 2004 Edition).
>
> This may be useful:
>
>
> http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_06_02
The bash documentation includes essentially the same text as the standard
describing the effect of omitting the colon in those word expansions.
> Thanks for bash, it rocks... :-)
:-)
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
Chet Ramey, ITS, CWRU chet@case.edu http://cnswww.cns.cwru.edu/~chet/