uninstall/install mysql on mac osx

If you have installed the Startup Item, use this command:

shell> sudo /Library/StartupItems/MySQLCOM/MySQLCOM start (Enter your password, if necessary) (Press Control-D or enter "exit" to exit the shell) 

If you don't use the Startup Item, enter the following command sequence:

shell> cd /usr/local/mysql shell> sudo ./bin/mysqld_safe (Enter your password, if necessary) (Press Control-Z) shell> bg