title: .bash_profile does not display echo information after update
body: <p>I am setting up environment variables, and after saving in <code>.bash_profile</code>, I gave this command: </p>
  
  <pre><code>echo "$SENDGRID_USERNAME"
  </code></pre>
  
  <p>After doing this, <code>bash</code> returned a blank line, and went back to the prompt on the following line.
  This made me wonder that something is there, but maybe bash is not showing it. Or is there something else involved?
  Also, do I need to have a path variable in the <code>.bash_profile</code>? If I do, what should it be?</p>