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Re: Process group id of first command in command substitution (bash4 vs
From: |
Chet Ramey |
Subject: |
Re: Process group id of first command in command substitution (bash4 vs bash3) |
Date: |
Mon, 20 Feb 2012 16:57:03 -0500 |
> 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?
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU chet@case.edu http://cnswww.cns.cwru.edu/~chet/