title: Batch renaming files after certain character
body: <p>I have a bunch of video files with names like so:</p>
  
  <pre><code>6592110904-Ivory-2.mp4
  6592280588-Cornflower.mp4
  6592321696-Ballet Pink.mp4
  </code></pre>
  
  <p>I want to rename them to get rid of everything after the first hyphen so they end up like:</p>
  
  <pre><code>6592110904.mp4
  6592280588.mp4
  6592321696.mp4
  </code></pre>
  
  <p>How do I go about doing this?</p>