Re: Process group id of first command in command substitution (bash4 vs bash3)

[Roman Rakus]

On 02/20/2012 10:57 PM, Chet Ramey wrote:
> > I'm not sure if it's a bug or not, but there is change between old bash
> > 3.2 and bash 4.2.
> > When you run a script:
> > set -m
> > $(sleep 1; sleep 2)
> >
> > in bash 4.2 the first sleep has same group id as parent shell. However
> > in bash 3.2 it has different group id.
> >
> > Is it bug or not? I'm not able to find documentation for this change.
> > And seems that POSIX says nothing about it.
> How could this possibly matter?
It could matter in sending (receiving) signal to process group.

RR