Re: PIPESTATUS differs from $? for compound command

[Mike Jonkmans]

On Wed, Dec 11, 2024 at 07:44:02PM -0500, Lawrence Velázquez wrote:
> On Wed, Dec 11, 2024, at 3:50 AM, Mike Jonkmans wrote:
> > Or worse: '! true | ! true' is a syntax error!?
> > Also errors in dash, but not in ksh.
> > Can a command - as part of a pipeline - not be a pipeline?
> Not directly, no.
> https://pubs.opengroup.org/onlinepubs/9799919799/utilities/V3_chap02.html#tag_19_10_02

Yes, the posix grammar doesn't allow it.
But it is not clear, from the bash documentation,
that a pipeline is not a command.

Moreover, bash accepts e.g.:
        ! ! false
How can you parse that, without a pipeline being a command?
Note that this is not posix, though bash accepts it even with --posix.

And, as said, ksh allows the construct (! true | ! true).
It is not impossible, it just is not posix.


> > What bothers me (only slightly), is the documentation.
> Judging by this thread, some clarification would be worthwhile.

! false

-- 
Regards, Mike Jonkmans