typo

_posts/2014-04-13-psql-connect-server.markdown

@@ -31,6 +31,6 @@ __Solution__:
 
 you do clean up for system. In this case, Brew's PostgreSQL .pid file is at ```/usr/local/var/postgres/postmaster.pid```
 
-    $ sudo /usr/local/var/postgres/postmaster.pid
+    $ sudo rm /usr/local/var/postgres/postmaster.pid
 
 Then you can start your postgres again. It's the same with every other daemons; you just need to find its PID file.