title: How do I remove colons from a list of MAC addresses?
body: <p>I'm having a hard time trying to remove the colons in a list of MAC addresses.</p>
  <p>My file:</p>
  <pre><code>00:21:5A:28:62:BF
  00:24:81:0A:04:44
  </code></pre>
  <p>Expected Output:</p>
  <pre><code>00215A2862BF
  0024810A0444
  </code></pre>