停止mysqld服务器。

Mac OS X:系统首选项→MySQL→停止MySQL服务器 Linux(从终端):sudo systemctl停止mysqld.service

Start the server in safe mode with privilege bypass From Terminal: sudo /usr/local/mysql/bin/mysqld_safe --skip-grant-tables In a new terminal window: sudo /usr/local/mysql/bin/mysql -u root This will open the MySQL command-line client. From here enter: UPDATE mysql.user SET authentication_string=PASSWORD('NewPassword') WHERE User='root'; FLUSH PRIVILEGES; quit Stop the mysqld server again and restart it in normal mode. Mac OS X (From Terminal): sudo /usr/local/mysql/support-files/mysql.server restart Linux Terminal: sudo systemctl restart mysqld

在终端中，写入mysql -u root -p并点击Return。

输入您必须记下的当前MySQL密码。

并设置密码:

SET PASSWORD = PASSWORD('new_password');

更多细节请参考这里的文档。

点击这里阅读更多。

截至2022年12月，以下适用于macOS Big Sur 11.2.3上的MySQL 8.0.26:

去系统首选> mysql >停止服务器 打开终端并运行:mysqld_safe——skip-grant-tables 打开一个新终端，运行:mysql -u root 运行:ALTER USER 'root'@'localhost' IDENTIFIED BY 'root'; ROOT将是您的新密码。 运行:FLUSH特权; 运行:退出 进入系统首选项> mysql >启动服务器

如果你忘记了你的密码或者想把它改成你的MySQL:

Start your terminal and enter: sudo su Enter the password for you system Stop your MySQL server: sudo /usr/local/mysql/support-files/mysql.server stop Leave this window open, run second terminal window and enter here: mysql -u root And change your password for MySQL: UPDATE mysql.user SET authentication_string=PASSWORD('new_password') WHERE User='root'; where "new_password" - your new password. You don't need old password for MySQL. Flush, quit and check your new password: FLUSH PRIVILEGES; Close all windows and check your new password for MySQL.

$ export PATH=$PATH:/usr/local/mysql/bin

now,to make this permanent:
$ echo 'export PATH=$PATH:/usr/local/mysql/bin' >> ~/.bash_profile

next, start mysql in safe mode:
$ sudo mysqld_safe --skip-grant-tables;

If this does not work, go to System Preferences and stop MySQL server.
next, On the **other** terminal, you may use the below:

$ mysql -u root

mysql> USE mysql;

mysql> UPDATE mysql.user SET authentication_string=null WHERE 
User='root';

mysql> FLUSH PRIVILEGES;

mysql> exit;

$ mysql -u root
mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH 
caching_sha2_password BY 'yourpassword';

$ mysql -u root -p
Enter password: 
mysql> SELECT user();

next, start the mysql server in normal mode. and you're done with resetting your root password. this worked for mysql 8.0.17 ver. for me.
thanks to everyone on top, https://stackoverflow.com/questions/36099028/error-1064-42000-you-have-an-error-in-your-sql-syntax-want-to-configure-a-pa,

https://www.houseninetytwo.com/how-to-use-mysql-in-terminal-on-mac-os-high-sierra/: ~:文本=你% 5月20日% 20 % 20了% 20,% 2 fmysql % 2 fbin % 2 fmysql。= % 20应该% 20执行% 20 % 20对,返回% 20 % 20版本% % 20 mysql中的20个。

我认为这是可行的:

ALTER USER 'root'@'localhost' IDENTIFIED BY 'YOURNEWPASSWORD'

(注意，如果你的用户名不是root，你可能应该用你的用户名替换root。)