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

You might want to add aliases to your shell’s resource file to make it easier to access commonly used programs such as mysql and mysqladmin from the command line. The syntax for bash is:

alias mysql=/usr/local/mysql/bin/mysql
alias mysqladmin=/usr/local/mysql/bin/mysqladmin