title: How do I delete all running Docker containers?
body: <p>I remember using</p>
  
  <pre><code>docker rm -f `docker ps -aq`
  </code></pre>
  
  <p>to chain the commands without an issue a few months ago, but now this isn't working, and I'm getting the following output:</p>
  
  <pre><code>unknown shorthand flag: 'a' in -aq`
  See 'docker rm --help'.
  </code></pre>
  
  <p>What changed? How can I delete all Docker running containers in one line? In case it helps, I'm using Docker for Windows (native with <a href="http://en.wikipedia.org/wiki/Hyper-V" rel="noreferrer">Hyper-V</a>, not with VirtualBox) on Windows&nbsp;10, and the command I used has worked fine with my previous Windows 8 Docker toolbox installation.</p>