title: Check Redis server version
body: <p><strong>how to check Redis server version?</strong></p>
  <p>I've found in <a href="http://redis.io/topics/quickstart" rel="noreferrer">Redis site</a> this command:</p>
  <blockquote>
  <p>$ redis-server</p>
  </blockquote>
  <p>and that should give me (according to the site):</p>
  <pre><code>[28550] 01 Aug 19:29:28 # Warning: no config file specified, using the default config. In order to specify a config file use 'redis-server /path/to/redis.conf'
  [28550] 01 Aug 19:29:28 * Server started, Redis version 2.2.12
  [28550] 01 Aug 19:29:28 * The server is now ready to accept connections on port 6379
  ... and so forth ...
  </code></pre>
  <p>but I get this instead:</p>
  <pre><code>[8719] 04 Feb 14:51:09.009 # Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf
  [8719] 04 Feb 14:51:09.009 # Unable to set the max number of files limit to 10032 (Operation not permitted), setting the max clients configuration to 3984.
  [8719] 04 Feb 14:51:09.009 # Creating Server TCP listening socket *:6379: bind: Address already in use
  </code></pre>
  <p>Which mean I need to configure it, but all I want is the version!</p>
  <p>So how do I check Redis server version?</p>