MySQL批量刷新用户密码

不知道用户密码，并且不改变用户密码的情况下，批量刷新MySQL数据库用户的密码
mysql> select concat('alter user \'',user,'\'@\'',host,'\' identified by \'',authentication_string,'\';') as change_password from mysql.user;
扩展：
在其他MySQL实例创建与本实例密码相同的用户
mysql> select concat('create user \'',user,'\'@\'',host,'\' identified by password \'',authentication_string,'\';') as create_user from mysql.user;