title: Bash script to convert from HTML entities to characters
body: <p>I'm looking for a way to turn this:</p>
  
  <pre><code>hello &amp;lt; world
  </code></pre>
  
  <p>to this:</p>
  
  <pre><code>hello &lt; world
  </code></pre>
  
  <p>I could use sed, but how can this be accomplished without using cryptic regex?</p>