title: Python OSError: [Errno 2]
body: <p>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.</p>
  
  <pre><code>#!/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)
  </code></pre>
  
  <p>Upon executing the code the following exception is thrown:</p>
  
  <pre><code>Traceback (most recent call last):
    File "./marp.py", line 82, in &lt;module&gt;
      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
  </code></pre>
  
  <p>I think I'm missing something obvious, can anyone see what's wrong with the code above?</p>