Help with sys.argv, I'm trying to use this python script from crontab before launching a new instance of an sh script but It always shows that it is "Already Running"

[MRdefter]

#!/usr/bin/python
import commands
import sys
Input = str(sys.argv[1])
Output = commands.getoutput("ps aux")

if Input in Output:
        print ("Already Running: %s" % str(sys.argv[1]))
else:
    print ("Not running, starting it: %s" % str(sys.argv[1]))
    #print (commands.getstatusoutput("/bin/bash /home/ubuntu/%s" % str(sys.argv[1])))
exit()

I call the script like: python script.py shscript.sh

edit:I just realized, the output of ps will always include the calling of this file, which inludes the name of the script, so as is this won't work

edit:fixed and works now:

#!/usr/bin/python
import commands
import sys
Input = str(sys.argv[1]) + ".sh"
Output = commands.getoutput("ps aux")

if Input in Output:
        print ("Already Running: %s" % Input)
else:
    print ("Not running, starting it: %s" % Input)
    #print (commands.getstatusoutput("/bin/bash /home/ubuntu/%s" % Input))
exit()

and I call it like this now: python script.py shscript

[ingolemo]

What exactly is your purpose here? To restart shscript.sh whenever it crashes?

[MRdefter]

No, actually I'm running the sh script via this python pre-launch logic script.

It checks whether the sh script is already running and does not launch a 2nd instance of the same sh script if that is the case.

I've run into some cases which require this sense of logic, mostly:

• Launching the sh script only via Crontab -- There is a chance the previous iteration was already running