title: docker-sync: command not found
body: <pre><code>$ gem install docker-sync
  
  ERROR: While executing gem ... (Errno::EACCES) Permission denied @ rb_sysopen - /usr/local/lib/ruby/gems/2.5.0/gems/docker-sync-0.5.9/Thorfile
  
  $ sudo gem install docker-sync
  
  Successfully installed docker-sync-0.5.9
  Parsing documentation for docker-sync-0.5.9
  Done installing documentation for docker-sync after 0 seconds
  1 gem installed
  
  $ docker-sync
  -bash: docker-sync: command not found
  </code></pre>
  
  <p>I have tried to install docker-sync on my Mac OSX 10.14.2 but bash does never found the command. Also not after reboot. What can I do?</p>