title: Why redis client does not respond to commands?
body: <p>Can someone say whats wrong happens and what can I do?</p>
  
  <p>I install redis by <a href="https://redis.io/download" rel="nofollow noreferrer">instruction</a> in Ubuntu. I run <code>redis-server</code> and it show me next screen.</p>
  
  <p><a href="https://i.stack.imgur.com/xu66R.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/xu66R.png" alt="enter image description here"></a></p>
  
  <p>After that I run <code>redis-cli</code> and try to run <code>PING</code> command but nothing happens. No error, no message. Whats wrong happens?</p>