mysql 5.7如何更改初始密码

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[root@qxy2 mysql]# service mysqld start
Redirecting to /bin/systemctl start  mysqld.service
[root@qxy2 mysql]# grep 'temporary password' /var/log/mysqld.log
2016-05-04T13:46:01.727652Z 1 [Note] A temporary password is generated for root@localhost: _?Xwo>%do7S8
[root@qxy2 mysql]# mysql -u root -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.12


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Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.


mysql>  ALTER USER 'root'@'localhost' IDENTIFIED BY 'Xy5686670@';
Query OK, 0 rows affected (0.00 sec)


mysql> 

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