Re: bash bug in $()

[Bruce Korb]

Eric Blake wrote:
> Dan Jacobson uncovered what I believe is a bash bug:
> http://article.gmane.org/gmane.comp.shells.bash.bugs/8574
>
> See my arguments as to why I think this is a violation of
> POSIX rules:
> http://article.gmane.org/gmane.comp.shells.bash.bugs/8575
>
> Although the Shell Substitutions portion of the manual
> already recommends using `foo` instead of $(foo),
> it may be worth adding to that section to also document
> that bash 3.0 (I haven't verified whether bash 3.1 has
> fixed the bug), zsh (as of 4.2.6), and ksh (5.2.14) all
> have a bug in parsing command substitutions with an

"pdksh", I presume?  David Korn's ksh works fine.
Meanwhile, rather than use context sensitive coding techniques,
always enclose the case patterns in full parenthesis pairs.
I don't know about ancient shells, but it seems to work fine
on every shell that accepts $().  Why should we care in
autoconf anyway, though?  Are we not still constrained to
pre-1977 Bourne shell syntax?  :)  Cheers - Bruce