title: OSError: [Errno 2] No such file or directory, in_execute_child raise child_exception
body: <p>I am new to Python and Linux, I am getting an error</p>
  
  <pre><code>File "usr/lib/python2.7/subprocess.py, line 1335, in_execute_child
  =======
   raise child_exception" 
  =======
   OSERROR: [Error 2] No Such File or Directory
  =======
  </code></pre>
  
  <p>This image shows the commands and error that I am facing:</p>
  
  <p><img src="https://i.stack.imgur.com/EiTyC.png" alt="Image"></p>