title: Kill detached screen session
body: <p>I learned from somewhere a detached screen can be killed by</p>
  
  <pre><code>screen -X -S [session # you want to kill] kill
  </code></pre>
  
  <p>where [session # you want to kill] can be gotten from</p>
  
  <pre><code>screen -ls
  </code></pre>
  
  <p>But this doesn't work. Anything wrong? What's the correct way?</p>