title: How do I add a command to .profile?
body: <p>I would like the command </p>
  
  <pre><code>PROMPT_COMMAND=echo
  </code></pre>
  
  <p>to be executed every time I open bash. I've been told that this command can be read from <code>~/.profile</code>, however, I do not know how to put it there. </p>