mac下安装mysql忘记密码的修改方法

mysql -u root -p

? bin sudo su
Password:
Sorry, try again.
Password:
sh-3.2# ./mysqld_safe --skip-grant-tables &
[1] 3477
sh-3.2# 2017-06-27T08:32:37.6NZ mysqld_safe Logging to '/usr/local/mysql-5.7.18-macos10.12-x86_64/data/localhost.err'.
2017-06-27T08:32:37.6NZ mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql-5.7.18-macos10.12-x86_64/data
sh-3.2#

~ mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 16
Server version: 5.7.18 MySQL Community Server (GPL)
Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.06 sec)

mysql> SET PASSWORD FOR root@'localhost' = PASSWORD('root');
Query OK, 0 rows affected, 1 warning (0.02 sec)

mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.00 sec)