FreeBSDwiki:MySQL, Adding Users
From Ubuntuwiki.net
To add new users to mysql use the following commands (if you haven't set a password for the mysql root user, leave off the -p):
oyabun# mysql -u root mysql -p password: > GRANT ALL PRIVILEGES ON *.* TO user@localhost IDENTIFIED BY 'pass' WITH GRANT OPTION;
Note: that command grants full privileges on ALL databases to "user@localhost", effectively creating a new mysql root user, which is usually not what you want. More frequently, you will want to GRANT ALL PRIVILEGES ON [[databasename]].* or something similar.
External Links
http://dev.mysql.com/doc/mysql/en/adding-users.html
http://sunsite.mff.cuni.cz/MIRRORS/ftp.mysql.com/doc/en/Adding_users.html