On 10/11/16 10:14 PM, s7v7nisla...@gmail.com wrote:
> 1. the script to reproduce
> bash-4.4$ cat t.sh
> (cd /tmp && sleep 20) &
> echo "end"
> 2. run it
> bash-4.4$ bash t.sh
> 3. script end, but there is a new forked script.
> bash-4.4$ ps -ef | grep t.sh
> 501 50268 1 0 10:09AM ttys015 0:00.00 bash t.sh
> 501 50275 50181 0 10:10AM ttys015 0:00.00 grep t.sh
> when using sh -> dash, It will not fork before subshell, what's the different?
> why bash bahavior like this? is that a bug?
It's not a bug; it's an opportunity for optimization. It's like this
because it hasn't come up as a performance problem. I'll take a look
at it. There are probably several opportunities like this.
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU c...@case.edu http://cnswww.cns.cwru.edu/~chet/