Python OSError: [Errno 2]

Question

I have the following code that is attempting to start each of the "commands" below in Linux. The module attempts to keep each of the 2 commands running if either should crash for whatever reason.

#!/usr/bin/env python import subprocess  commands = [ ["screen -dmS RealmD top"], ["screen -DmS RealmD top -d 5"] ] programs = [ subprocess.Popen(c) for c in commands ] while True:     for i in range(len(programs)):         if programs[i].returncode is None:             continue # still running         else:             # restart this one             programs[i]= subprocess.Popen(commands[i])         time.sleep(1.0) 

Upon executing the code the following exception is thrown:

Traceback (most recent call last):   File "./marp.py", line 82, in <module>     programs = [ subprocess.Popen(c) for c in commands ]   File "/usr/lib/python2.6/subprocess.py", line 595, in __init__     errread, errwrite)   File "/usr/lib/python2.6/subprocess.py", line 1092, in _execute_child     raise child_exception OSError: [Errno 2] No such file or directory 

I think I'm missing something obvious, can anyone see what's wrong with the code above?

Answer 1

Use ["screen", "-dmS", "RealmD", "top"] instead of ["screen -dmS RealmD top"].

Maybe also use the complete path to screen.

Answer 2

Only guess is that it can't find screen. Try /usr/bin/screen or whatever which screen gives you.