Re: PIPESTATUS differs from $? for compound command

[microsuxxor]

the | true is the.last pipe
while witbout , its.one cmd less
the | true is $pipestatus[1][*]

On Tue, Dec 10, 2024, 4:31 AM Dale R. Worley <worley@alum.mit.edu> wrote:

> Andreas Schwab <schwab@linux-m68k.org> writes:
> >> But the PIPESTATUS refers to the 'false' pipeline:
> >>      $ if false; then :; fi; echo ${PIPESTATUS[*]}
> >>      1
> >
> > $ if false; then :; fi | true; echo ${PIPESTATUS[*]}
> > 0 0
> >
> > Why is that not `1 0'?  After all, the last executed commands as part of
> > the pipeline (by your reasoning) are `false' and `true'.
>
> It looks complicated:
>
>     $ if false; then :; fi | true; echo ${PIPESTATUS[*]}
>     0 0
>     $ if false; then :; fi | true; echo $?
>     0
>     $ if false; then :; fi ; echo ${PIPESTATUS[*]}
>     1
>     $ if false; then :; fi ; echo $?
>     0
>
> I'm sure there's an explanation, but I'm not feeling up to spelunking
> through the documentation enough to figure it out.
>
> Dale
>
>