title: How is the @ sign working in this command?
body: <p>I was working through this <a href="http://www.bytereef.org/howto/djb/daytime-server.html" rel="nofollow noreferrer">guide</a> to setup a daytime service. Near the end of the guide, after starting the service, it lists the command</p>
  
  <pre><code>date@ 127.0.0.1
  </code></pre>
  
  <p>This returns the current date and time, which is awesome! But how does it do that? I've never seen that syntax before. </p>