My platform is ROS Ubuntu in Raspberry Pi 2. I started a shell script by running python node to restart all process. However, when I kill the python node, everything started by the python node is also killed.
Python:
from subprocess import call
call(['bash', 'run.sh'])
My questions:
- Is there any way to kill and restart the process in python?
- Is it possible to kill the python node but keep alive those processes that were started by that python node?
1 Answer
Suppose we run some kind of python script via python stuff.py. We can easily find it's PID via pgrep
$ pgrep -f stuff.py
7573
And kill with pkill in a similar fashion.
$ pkill -f stuff.py
If you want to kill only the child process, and not script itself, then we need to find out the children. ps command allows printing processes with PPID ( parent PID) . So if you know the parent ( your python script) then you know the children too.
$ ps -e -o args,pid,ppid | grep $(pgrep -f run_bash.py ) | grep -v grep
python run_bash.py 8186 4021
watch ls 8187 8186
Here my python script runs watch ls command. I can kill 8187 to close watch ls and let python script move on to the other things.
