Re: Special built-ins not persisting assignments

[Pierre Gaston]

On Tue, Mar 25, 2014 at 2:39 AM, Pollock, Wayne <wpollock@hccfl.edu> wrote:

> $ echo $BASH_VERSION
> 4.2.45(1)-release
>
> $ unset foo
>
> $ foo=bar :
>
> $ echo $foo
>
>
> $
>
> ===============
>
> According to POSIX/SUS issue 7, assignments for special builtins
> should persist.  So the output should be ``bar''.
>
> Is there a setting I should turn off (or need to enable), to
> make this work correctly?
>
> I was able to confirm this bug for version 4.2.37(1)-release as
> well.  (zsh 4.3.17 (i386-redhat-linux-gnu) has the same bug.)
>
> --
> Wayne Pollock

It works when bash runs in posix mode, eg:

$ POSIXLY_CORRECT=1 bash -c 'foo=bar : ;echo $foo'
bar
$ bash --posix -c 'foo=bar : ;echo $foo'
bar