title: Showing only the uptime from uptime [unix]
body: <p>I'd like to trim the output from uptime</p>
  
  <pre><code>20:10  up 23 days,  3:28, 3 users, load averages: 3.84 1.06 0.64
  </code></pre>
  
  <p>so that it just shows:</p>
  
  <pre><code>23 days
  </code></pre>
  
  <p>I've tried using sed, but I'm not sure it's the right tool for the job, and don't have much experience using it.</p>
  
  <p>How can I achieve the output I want?</p>