[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
bug#23090: true and false not POSIX
From: |
Ruediger Meier |
Subject: |
bug#23090: true and false not POSIX |
Date: |
Tue, 22 Mar 2016 17:39:19 +0100 |
User-agent: |
KMail/1.9.10 |
On Tuesday 22 March 2016, Eric Blake wrote:
> On 03/22/2016 09:08 AM, Stephane Chazelas wrote:
> >> BTW I know about POSIXLY_CORRECT env. I just ask this: Is it worth
> >> to violate parts of POSIX just for minor cosmetical reasons?
> >>
> >> I mean echo -n/-e may be an improvement though non-posix. But
> >> echo --version is a violation just for cosmetics, true --version
> >> is even worse.
> >
> > AFAICT, echo --version is a violation, true --version is not.
>
> 'echo --version' is not a violation. POSIX says that you are allowed
> to require the user to set a particular environment variable to enter
> the POSIX-conformant setup; in GNU coreutils' case, that variable is
> POSIXLY_CORRECT. When set, coreutils' echo behaves exactly as POSIX
> requires. When not set, coreutils' echo behaves as GNU Coding
> Standards require. As the two standards conflict, we cannot do both
> behaviors at once; so the behavior of choice is determined by your
> environment variables.
>
> In the case of 'true' and 'false', the two standards do not conflict,
> so we implement both of them at once without the need to resort to
> reading POSIXLY_CORRECT from the environment.
You could also let true behave like rm if POSIXLY_CORRECT is not set or
if more than zero option given. Does it make sense to change the
behavior fundamentally?
IMO bash for example does the most natural trade-off. They have -neE but
nothing else.
cu,
Rudi
- bug#23090: true and false not POSIX, Ruediger Meier, 2016/03/22
- bug#23090: true and false not POSIX, Stephane Chazelas, 2016/03/22
- bug#23090: true and false not POSIX, Ruediger Meier, 2016/03/22
- bug#23090: true and false not POSIX, Stephane Chazelas, 2016/03/22
- bug#23090: true and false not POSIX, Eric Blake, 2016/03/22
- bug#23090: true and false not POSIX,
Ruediger Meier <=
- bug#23090: true and false not POSIX, Paul Eggert, 2016/03/22
- bug#23090: true and false not POSIX, Stephane CHAZELAS, 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, Eric Blake, 2016/03/22