title: How to delete the line that matches a pattern and the line after it with sed?
body: <p>I have a file that looks something like:</p>
  
  <pre><code>good text
  good text
  FLAG bad text
  bad text
  good text
  good text
  good test
  bad Text FLAG bad text
  bad text
  good text
  </code></pre>
  
  <p>I need to delete any line containing "FLAG" <em>and</em> I <em>always</em> need to delete the one line immediately following the "FLAG" line too.</p>
  
  <p>"FLAG" lines come irregularly enough that I can't rely on any sort of line number strategy.</p>
  
  <p>Anyone know how to do this with sed?</p>