startup MySQL on mac

from
http://dev.mysql.com/doc/refman/5.0/en/mac-os-x-installation.html

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
(Press Control-D or enter "exit" to exit the shell)