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Re: is ${!...} portable?
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From: |
Mike Frysinger |
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Subject: |
Re: is ${!...} portable? |
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Date: |
Sun, 31 May 2009 03:10:36 -0400 |
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User-agent: |
KMail/1.11.3 (Linux/2.6.29.2; KDE/4.2.3; x86_64; ; ) |
On Sunday 31 May 2009 02:06:41 Werner LEMBERG wrote:
> Sometimes indirect expansion helps a lot in writing shell scripts. Is
> `${!foo}' portable or an invention of Bash?
it's specific to bash
> Perhaps it makes sense to mention this in the autoconf info file.
maybe, but where would you stop ? how much do you cover what is effectively
"bash extensions over POSIX" ? there's quite a bit there.
you can review the POSIX documentation here:
http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html
-mike
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