title: docker-exec failed: "cd": executable file not found in $PATH
body: <p>I used this command:<br>
  <code>docker exec compassionate_mclean cd /root/python</code><br>
   The error returned is </p>
  
  <blockquote>
    <p>docker-exec: failed to exec: exec: "cd": executable file not found in
    $PATH</p>
  </blockquote>
  
  <p>Kindly help me out</p>