From: "Sean C. Farley" <sean@farley.org>
To: zsh-workers@sunsite.dk
Subject: Re: PATCH: zsh-4.2.1: unset does not follow spec
Date: Wed, 22 Sep 2004 10:37:05 -0500 (CDT) [thread overview]
Message-ID: <20040922103029.D63284@thor.farley.org> (raw)
In-Reply-To: <Pine.LNX.4.61.0409220822040.16822@toltec.zanshin.com>
On Wed, 22 Sep 2004, Bart Schaefer wrote:
> On Wed, 22 Sep 2004, Sean C. Farley wrote:
>
>> Recently, I read that FreeBSD's /bin/sh fails:
>> http://www.freebsd.org/cgi/query-pr.cgi?pr=standards/45738
>> the IEEE Std 1003.1-2001:
>> http://www.opengroup.org/onlinepubs/007904975/utilities/unset.html
>> when it comes to the builtin unset. tcsh and bash do follow it.
>
> I don't see how zsh "fails" this specification.
>
> EXIT STATUS
>
> 0
> All name operands were successfully unset.
> >0
> At least one name could not be unset.
>
> It appears to me that FreeBSD and Zsh are interpreting "could not be
> unset" to include variables that were not set in the first place.
> After all, if it isn't set, you can't UNset it, can you? It doesn't
> say "0 if all name operands end up unset after this is finished,
> regardless of their previous state" (which is how bash and tcsh appear
> to interpret it).
This is also in the spec:
Unsetting a variable or function that was not previously set shall
not be considered an error and does not cause the shell to abort.
I assume non-zero is an error.
> I'm going to ask about this on the austin-group list. It'll give them
> something to discuss that they might actually come to agreement on.
>From your comment, it sounds like hell might freeze over first. :)
I can see where both views are correct. Let me know when you hear back
from them.
Sean
---------------
sean@farley.org
next prev parent reply other threads:[~2004-09-22 15:37 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-22 15:04 Sean C. Farley
2004-09-22 15:28 ` Bart Schaefer
2004-09-22 15:37 ` Sean C. Farley [this message]
2004-09-22 18:55 ` Matthias B.
2004-09-23 7:54 ` Bart Schaefer
2004-09-23 9:20 ` Peter Stephenson
2004-09-23 9:26 ` Oliver Kiddle
2004-09-23 16:14 ` Bart Schaefer
2004-09-22 15:44 ` Peter Stephenson
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