Question

Task is to execute bash script from python script and let it execute on background, even if python script will finish. I need UNIX solution and i do not care if it will be not working on Win.

Python script :

#!/usr/bin/env python
import os, commands
command = '/usr/bin/ssh localhost "/home/gd/test/python/back.sh  "   '
print os.spawnlp(os.P_NOWAIT,command)
print "Python done"

/home/gd/test/python/back.sh :

#!/usr/bin/bash

/bin/echo "started"
/bin/sleep 80
/bin/echo "ended"

The issue is, when python script starts , i see PID of spawned process printed. But there is no process on background. When i use P_WAIT i see exit code 127 which means that command not found in the path. But i already provided all paths that already possible?
These scripts works perfectly with commands.getouput.

Answer 1

Something like this should work

#!/usr/bin/env python
import os
command = ['/usr/bin/ssh', 'ssh', 'localhost', '/home/gd/test/python/back.sh']
print os.spawnlp(os.P_NOWAIT, *command)
print "Python done"

Note that it’s preferable to use the subprocess module here instead of spawn

#!/usr/bin/env python
from subprocess import Popen
command = ['/usr/bin/ssh', 'localhost', '/home/gd/test/python/back.sh']
print Popen(command)
print "Python done"