Re: why are pipeline commands (allowed to be) executed in subshells?

[Chet Ramey]

On 12/12/22 8:29 PM, Philippe Cerfon wrote:
> On Sat, Nov 26, 2022 at 6:48 PM Chet Ramey <chet.ramey@case.edu> wrote:

> So when I have e.g.
> while true; do
>      sleep 60
>      check_for_condition && break
> done
>
> as well as a trap on e.g. HUP and INT that set some condition to be true,
> and then send a HUP to the executing shell, I'd expect that it
> waits(!) for the sleep to finish until it breaks out of the loop. And
> indeed it does. The HUP signal is only received by the shell, the
> child processes don't seem to get it.
>
>
> However, when sending an INT, the child immediately seems to see the INT.

I can't reproduce this in either interactive or non-interactive shells.

--
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet@case.edu    http://tiswww.cwru.edu/~chet/