title: How to cancel shutdown on Linux?
body: <p>I'm familiar with and use <code>shutdown</code> in Linux, and typically just do</p>
  <p><code>&gt; shutdown -h now</code></p>
  <p>But is there a way to stop shutdown from happening, say if I aim to shutdown 10 minutes from now and then in 5 minutes' time I discover I really don't want to shut down?</p>