Re: Special built-ins not persisting assignments

[Mike Frysinger]

On Tue 25 Mar 2014 00:39:18 Pollock, Wayne 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.)

as noted, this is a feature of bash :)

POSIX also imposes annoying behavior that bash fixes:
        unset foo       
        f() { :; }
        foo=bar f
        echo $foo

POSIX will show bar (ugh) while bash will not (yeah!)
-mike

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