1. MySQL服務的啟動：service mysqld start
2. 進入MySQL：mysql
3. 退出MySQL：exit 或者 q
4. 初次登錄並設置密碼：
$ mysql -u root
mysql> SET password=PASSWORD( 'password' );
5. 再次登錄命令：mysql -u root -p
6. 查詢用戶密碼：select user, host, password from mysql.user;
7. 更改密碼：
> UPDATE user SET password=PASSWORD( 'new password' ) WHERE user='user name';
> FLUSH PRIVILEGES;
> QUIT
8. 更改密碼二：
> SET PASSWORD FOR user name=PASSWORD('new password');
> QUIT
