title: Clearing macros
body: <p>The following command removes all variables, scalars and programs that I add:</p>
  
  <pre><code>clear all 
  </code></pre>
  
  <p>However, global and local macros stick around.</p>
  
  <p>I would like to know how to clear these out:</p>
  
  <ul>
  <li>interactively from the command line and/or </li>
  <li>as an opening line in my <code>do</code> files</li>
  </ul>