title: How to brew uninstall postgres on OX Sierra
body: <p>Reading from the <a href="https://stackoverflow.com/questions/8037729/completely-uninstall-postgresql-9-0-4-from-mac-osx-lion">here</a>, I want to uninstall postgres completely with homebrew and have used <code>brew uninstall postgresql</code> but I get this response. </p>
  
  <pre><code>No such keg: /usr/local/Cellar/postgresql
  </code></pre>
  
  <p>I know postgres is running because when I run <code>ps auxwww | grep postgres</code> I see <code>/usr/local/opt/postgresql94/bin/postgres -D /usr/local/var/postgres</code>. What am I doing wrong? I have mac Sierra</p>