Re: export in posix mode

[Bob Proulx]

Eric Blake wrote:
> James Mason wrote:
> > I certainly could be doing something wrong, but it looks to me like bash
> > - when in Posix mode - does not suppress the "-n" option for export.  
> > The version of bash that I'm looking at is 3.2.25.
> 
> So what?  Putting bash in posix mode does not require bash to instantly
> prohibit extensions.  POSIX intentionally allows for implementations to
> provide extensions, and 'export -n' is one of bash's extensions.
> There's no bug here, since leaving the extension always enabled does not
> conflict with subset of behavior required by POSIX.

If you are looking to try to detect non-portable constructs then you
will probably need to test against various shells including ash.  (If
on Debian then use dash.)

  https://en.wikipedia.org/wiki/Almquist_shell

The posh shell was constructed specifically to be as strictly
conforming to posix as possible.  (Making it somewhat less than useful
in Real Life but it may be what you are looking for.)  It is Debian
specific in origin but should work on other systems.

  http://packages.debian.org/sid/posh
  http://anonscm.debian.org/gitweb/?p=users/clint/posh.git;a=summary

Bob