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bug#23090: true and false not POSIX
From: |
Eric Blake |
Subject: |
bug#23090: true and false not POSIX |
Date: |
Tue, 22 Mar 2016 12:00:55 -0600 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0 |
On 03/22/2016 11:56 AM, Ruediger Meier wrote:
>> The man page (and --help output) specifically state:
>>
>> NOTE: your shell may have its own version of true, which
>> usually super‐
>> sedes the version described here. Please refer to your
>> shell's docu‐
>> mentation for details about the options it supports.
>
> I knew this note. However in the real world it simply does not make
> sense to get a man page about something which is not used usually.
It's not coreutils' fault if distros don't know how to make 'man true'
redirect to the shell's man page.
> I suggest an enhancement for portability and implementation simplicity
> to remove the options --version and --help from true, false echo and [.
Sorry, but that would violate GNU Coding Standards, so we aren't going
to do it.
>
> It's a problem that the most used implementations (POSIX or built-ins)
> behave differently and users might not be aware this fact when they use
> the coreutils implementations by mistake or on purpose. Since the use
> cases when somebody really needs a true, false or echo _binary_ are
> rare, the probabilty is high that the user assumes well known behavior.
The probability that someone knows well-known GCS behavior of '--help'
working are also high. At this point, the change would be more
disruptive than keeping the status quo.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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bug#23090: true and false not POSIX, Eric Blake, 2016/03/22
- bug#23090: true and false not POSIX, Eric Blake, 2016/03/22
- bug#23090: true and false not POSIX, Ruediger Meier, 2016/03/22
- bug#23090: true and false not POSIX, Eric Blake, 2016/03/22
- bug#23090: true and false not POSIX, Ruediger Meier, 2016/03/22
- bug#23090: true and false not POSIX,
Eric Blake <=
- bug#23090: true and false not POSIX, Ruediger Meier, 2016/03/22
- bug#23090: true and false not POSIX, Eric Blake, 2016/03/22
- bug#23090: true and false not POSIX, Bernhard Voelker, 2016/03/22