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Re: Special parameter ?

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  Re: Special parameter ? Eduardo A. Bustamante López <dualbus@gmail.com> - 2018-09-21 08:17 -0700

#14623 — Re: Special parameter ?

On Fri, Sep 21, 2018 at 04:17:11PM +0200, Enrique Soriano wrote:
> > You're seeing the status from the creation of the background job (which is
> > always 0), not from its completion.
> 
> Ah, I see.
> 
> Anyway, the behavior is not coherent with the manual page: in this
> case, $? has the status from the creation of the background job,
> that's not "the status of the most recently executed foreground
> pipeline".

The thing that creates the background job IS a foreground pipeline. It's a foreground pipeline that creates a background
job, if that makes sense.

dualbus@ubuntu:~$ cat t.sh
(exit 2)
(exit 3) & pid=$!
echo $?
wait "$pid"
echo $?

dualbus@ubuntu:~$ bash t.sh
0
3

I recommend to store the value of $? in a variable if you plan on using it afterwards, since it's extremely easy to end
up overriding its value.

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