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1.登陆mysql或者mariadb(两种任选其一)
[root@localhost ~]# mysql -u root
[root@localhost ~]# mysql -uroot -p
2.切换到存储用户名和密码的数据库
MariaDB [mysql]> use mysql;回车，会显示以下内容
Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A
Database changed
3.修改密码，适用password()函数进行加密，实际上就是执行sql语句来更新指定用户的密码
MariaDB [mysql]> update user set password=password(‘新密码‘) where user=‘要更新密码的用户名‘;回车
-> ;
Query OK, 0 rows affected (0.00 sec)
Rows matched: 5 Changed: 0 Warnings: 0
4.刷新用户权限列表
MariaDB [mysql]> flush privileges;回车
Query OK, 0 rows affected (0.00 sec)
5.退出mysql登陆
MariaDB [mysql]> quit
Bye
6.重启mysql或者mariadb服务
[root@localhost ~]# service mysqld restart(重启mysql)
[root@localhost ~]# service mariadb restart(重启mariadb)
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原文地址：http://www.cnblogs.com/hafiz/p/5874110.html
