How to check if program is running by python script?

Question

Now I have a udp_server.py to run.

According to my less experience, I will do a python script in crontab as bellow.

import commands
output = commands.getoutput("ps aux | grep udp_server.py")
'''print output 
user      8695  0.0  0.3  50948 14196 pts/0    S    10:21   0:00 python udp_server.py
user      9486  0.0  0.0   4400   584 pts/0    S+   10:34   0:00 sh -c {  ps aux | grep 'udp_server.py'; } 2>&1
user      9488  0.0  0.0   9384   888 pts/0    R+   10:34   0:00 grep udp_server.py
'''
if 'python udp_server.py' in output:
    print "The server is active."

is this right?

What is "right" for you? Does running udp_server.py print that kind of output? Are you trying to run the pgrep command to check if the process is running already? Is this being run within udp_server.py to see if it's already running from the cron job and as such would have to ignore itself in the list? — Eric Renouf
– Eric Renouf, Commented Sep 9, 2015 at 3:04
Also, you might want to check this question: Process list on Linux via Python — Eric Renouf
– Eric Renouf, Commented Sep 9, 2015 at 3:08
I just want to know the process whether it is existent or not. — Burger King
– Burger King, Commented Sep 9, 2015 at 7:05

user5481449 · Accepted Answer · 2015-10-23 19:10:03Z

1

If you want to type command line as like typing in unix console, it's right.

Suppose you will package the code in a file, maybe you will encounter a problem: it can't excute command. It's because your account in linux hasn't enough authority, I suggest you do as the following:

sudo python command_file.py

By the way, if you really work in python2.6+, please notice the api, deprecated since version 2.6: The commands module has been removed in Python 3. Use the subprocess module instead. So I suggest you replace it form subprocess. Reference hypelink: commands

answered Oct 23, 2015 at 19:10

user5481449

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