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Wed, 11 Aug 2021 20:00:12 -0400
My apologies in advance for not responding in thread. The bug-bash
archive interface doesn't expose the "Message-ID" header anywhere I can
find, and I am not a subscriber. I suppose I should become one. :)
> I believe I'd rather have variables behave as they're documented. It's more
The whole point of a standard like POSIX is that I should be able to
write my code in accordance with the standard and have it run on
compliant systems that I may not even be aware of or that might not have
been developed yet.
The standard determines what is "predictable" behavior, not the Bash
> That's one of the problems here: the author never intended this script to
> run in any shell other that Debian's dash. If they had, maybe they would
> have tested it on other shells, even other shells that Debian includes.
The author intended for portability and POSIX compliance. Otherwise,
the script header would not have read "#! /bin/sh". It runs as expected
on dash and ksh.
POSIX is supposed to enable portability. Compliant code should run the
same on any compliant interpreter or compiler. How can I possibly test
on all systems that try to be compliant? I may not be aware of all of
them or one may not even exist yet.
Requiring someone to test on all possible current and future shells that
claim POSIX-compliance defeats the purpose of a reference.
As an aside: I believe in thorough testing in as many environments as
> Even then (using either solution), what does a script do if it wants to
> be invoked as:
> GROUPS='abelian ...' script [options]
> That case works, see above. Maybe it shouldn't, but it does.
This doesn't work unless it was recently fixed. A variation does...
bash-5.0$ echo $BASH_VERSION
bash-5.0$ GROUPS=FOO bash -c 'echo $GROUPS'
bash-5.0$ GROUPS=FOO bash --posix -c 'echo $GROUPS'
bash-5.0$ env GROUPS=FOO bash -c 'echo $GROUPS'
bash-5.0$ env GROUPS=FOO bash --posix -c 'echo $GROUPS'
The same is the case for UID...
bash-5.0$ UID=x bash -c 'echo $UID'
bash: UID: readonly variable
I could be wrong here if this was recently fixed.
> It could have, but I'm not seeing a good enough reason to change it
> 25-30 years in.
I think the result is that this report will surface at regular intervals
for decades to come.
Re: GROUPS, Chet Ramey, 2021/08/10
Re: GROUPS, Franklin, Jason, 2021/08/10
Franklin, Jason <=
- Re: GROUPS, Greg Wooledge, 2021/08/11
- Re: GROUPS, Chet Ramey, 2021/08/13
- Re: GROUPS, Franklin, Jason, 2021/08/13
- Re: GROUPS, Dale R. Worley, 2021/08/16
- Re: GROUPS, Robert Elz, 2021/08/17
- Re: GROUPS, Dale R. Worley, 2021/08/20