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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