From: Vincent Lefevre <vincent@vinc17.net>
To: zsh-users@zsh.org
Subject: Re: grammar triviality with '&&'
Date: Wed, 4 Mar 2015 16:03:23 +0100 [thread overview]
Message-ID: <20150304150323.GC25170@ypig.lip.ens-lyon.fr> (raw)
In-Reply-To: <CABx2=D8FCUQjoR7+6k9WBO3rU97tnJMFnpib5YMG1Sqcia=gew@mail.gmail.com>
On 2015-03-02 20:43:27 -0800, Kurtis Rader wrote:
> On Mon, Mar 2, 2015 at 8:15 PM, ZyX <kp-pav@yandex.ru> wrote:
> >
> > I do not think this is a mistake. And I found at least two differences:
> >
> > 1. `command test --help` returns zero, `command \[ --help` displays help.
> > 2. `[` requires `]` (unless it received `--help` or `--version`), no
> > matter what name it is called with, `test` requires not.
> >
> > Note that coreutils ebuild does *not* contain any references to `test` or
> > `[`, patches as well do not (except when Makefile is patched not to
> > regenerate man pages). This means that this difference is created by GNU
> > developers, *not* by distro maintainers.
> >
>
> Ugh! I can confirm your observations using my Ubuntu 14.04 server. Yet on
> Mac OS X Yosemite the two names are linked to the same binary. Mac OS X
> exhibits the traditional behavior. I have no idea why GNU based distros
> have the two names linked to slightly differently behaving binaries.
Having different behaviors is required by POSIX:
http://pubs.opengroup.org/onlinepubs/9699919799/utilities/test.html
However you do not need different binaries to get different
behaviors: the binary could look at argv[0] to know how to
behave.
--
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
next prev parent reply other threads:[~2015-03-04 15:03 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-01 16:07 Ray Andrews
2015-03-01 16:43 ` ZyX
2015-03-01 17:01 ` Ray Andrews
2015-03-01 18:48 ` Bart Schaefer
2015-03-01 19:00 ` ZyX
2015-03-01 19:16 ` Ray Andrews
2015-03-01 20:48 ` ZyX
2015-03-01 18:49 ` Lawrence Velázquez
2015-03-02 2:27 ` Vincent Lefevre
2015-03-02 3:12 ` Ray Andrews
2015-03-02 5:22 ` Lawrence Velázquez
2015-03-02 3:53 ` Kurtis Rader
2015-03-02 4:18 ` Ray Andrews
2015-03-02 5:22 ` Kurtis Rader
2015-03-02 16:17 ` Ray Andrews
2015-03-02 18:52 ` Kurtis Rader
2015-03-02 19:03 ` ZyX
2015-03-02 20:16 ` Kurtis Rader
2015-03-03 4:15 ` ZyX
2015-03-03 4:43 ` Kurtis Rader
2015-03-04 15:03 ` Vincent Lefevre [this message]
2015-03-04 19:07 ` ZyX
2015-03-02 19:25 ` Ray Andrews
2015-03-02 10:46 ` Vincent Lefevre
2015-03-02 11:06 ` Peter Stephenson
2015-03-02 19:19 ` Bart Schaefer
2015-03-04 14:47 ` Vincent Lefevre
2015-03-05 1:51 ` Bart Schaefer
2015-03-05 10:06 ` Peter Stephenson
2015-03-02 8:54 ` Bart Schaefer
2015-03-02 10:31 ` Vincent Lefevre
2015-03-02 16:31 ` Ray Andrews
2015-03-02 16:49 ` Bart Schaefer
2015-03-02 17:38 ` Ray Andrews
2015-03-02 18:51 ` Bart Schaefer
2015-03-04 8:55 ` Vincent Lefevre
2015-03-04 17:12 ` Ray Andrews
2015-03-06 4:59 ` Bart Schaefer
2015-03-06 16:10 ` Ray Andrews
2015-03-06 20:23 ` Lawrence Velázquez
2015-03-06 21:25 ` Ray Andrews
2015-03-06 16:32 ` Vincent Lefevre
2015-03-06 17:43 ` Bart Schaefer
2015-03-06 21:01 ` Ray Andrews
2015-03-09 11:26 ` Vincent Lefevre
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