On Tue, May 17, 2016 at 04:05:57PM +0000, Christos Zoulas wrote:
> In article <17323.1463479...@andromeda.noi.kre.to>,
> Robert Elz <k...@munnari.oz.au> wrote:
> >The posix shell standard does not allow empty sub-shells, or command
> >groups. That is, both
> > ( )
> >and
> > { }
> >(even if you write the latter as "{ ; }" though it turns out the ';'
> >there is not actually required, as it, or a \n, usually is before '}')
> >are both syntax errors.
>
> [stuff deleted]
>
> >ps: various other places, beyond the one from PR bin/48489 (which is
> >fixed already I believe) where empty "commands" were permitted will also
> >get corrected by this fix.
>
> I think we should probably have "strict posix mode" for this (via an
> environment variable or command line switch?) ...
> Allowing relaxed syntax like this is convenient.
For braces, yes - that is at least semantically sensible. For a
subshell, I'd say not so much.
Also, accepting invalid syntax that other shells reject eventually
bites us.
--
David A. Holland
dholl...@netbsd.org
