First of all you should know  how you can add users in mysql databases:-

• Using CREATE USER and/or GRANT commands
• Inserting a new record into the mysql.user table
  

First let's see how to use the CREATE USER command:-

     CREATE USER user [IDENTIFIED BY [PASSWORD] 'password']

e.g   

mysql>CREATE USER 'myuser'@'localhost' IDENTIFIED BY 'mypassword';

Once user added in databases you need to provide privileges to that user.You can use like:-

mysql>GRANT SELECT,INSERT,UPDATE,DELETE ON *.* TO 'myuser'@'localhost';
or mysql>GRANT ALL ON *.* TO 'myuser'@'localhost';


Another way for creating users in mysql is just enter directoly in user table of mysql and make few entries:-

mysql> INSERT INTO user VALUES('localhost','monty',PASSWORD('some_pass'),
     'Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y');
or
mysql> INSERT INTO user (Host,User,Password) VALUES('localhost','usename','pass');
mysql> FLUSH PRIVILEGES;


Mysql commands:-
* isamchk - Check and repair of ISAM tables.
        * isamlog - Write info about whats in a nisam log file.
        * msql2mysql
        * my_print_defaults
        * myisamchk
        * myisamlog
        * myisampack
        * mysql - text-based client for mysqld, a SQL-based relational database daemon
        * mysql_config
        * mysql_convert_table_format
        * mysql_find_rows
        * mysql_fix_privilege_tables
        * mysql_install_db
        * mysql_setpermission
        * mysql_zap - a perl script used to kill processes
        * mysqlaccess - Create new users to mysql.
        * mysqlbinlog
        * mysqlbug
        * mysqlcheck
        * mysqld_multi - Used for managing several mysqld processes running in different UNIX sockets and TCP/IP ports.
        * mysqldump - text-based client for dumping or backing up mysql databases , tables and or data.
        * mysqldumpslow
        * mysqlhotcopy
        * mysqlimport
        * mysqlshow - Shows the structure of a mysql database (databases,tables and columns)
        * mysqltest
        * pack_isam
        * perror - used to display a description for a system error code, or an MyISAM/ISAM table handler error code.
        * replace - A utility program to replace changes strings in place in files or on the standard input.
        * resolve_stack_dump
        * resolveip