title: How to create a task that prints command line arguments?
body: <p>I'm finding the documentation at <a href="http://www.scala-sbt.org/0.13/docs/Input-Tasks.html" rel="noreferrer">http://www.scala-sbt.org/0.13/docs/Input-Tasks.html</a> utterly baffling. Can someone provide me with a complete example of a task/input task that takes a command line argument and does something with it e.g.:</p>
  
  <pre><code>sbt "greeting hello world"
  </code></pre>
  
  <p>and prints "hello world"</p>