title: Print number of keys in Redis
body: <p>Is there a way to print the number of keys in Redis?</p>
  
  <p>I am aware of </p>
  
  <pre><code>keys *
  </code></pre>
  
  <p>But that seems slightly heavy weight. - Given that Redis is a key value store maybe this is the only way to do it. But I would still like to see something along the lines of </p>
  
  <pre><code>count keys *
  </code></pre>