Use the mysqladmin command to modify the MySQL password and forget the password

Change Password:
1. For example, if your root user does not have a password and you want to change the password to 123456, the command is:
Mysqladmin-u root password 123456
2. If your root account has a password (123456), the command to change the password to abcdef is:
Mysqladmin-u root-p password abcdef
Note: After you press enter, you will be asked about the old password. After you enter the old password 123456, the command is completed and the password is modified successfully.
3. If your root account has a password (123456), the command to change the password to abcdef is:
Mysqladmin-u root-p123456 password abcdef
Write them together. Otherwise, an error will occur. The error is shown below)
4. Use phpmyadmin, which is the simplest. Modify the user table of the mysql database,

But don't forget to use the PASSWORD function.

Forgot password:
Below we provide six different methods to modify the password of the mysql root User and add the mysql user.
Method 1
Phpmyadmin is the simplest. Modify the user table of the mysql database,
But don't forget to use the PASSWORD function.
Method 2
Use mysqladmin, which is a special case stated above.
Mysqladmin-u root-p password mypasswd
After entering this command, you need to enter the original root password, and then the root password will be changed to mypasswd.
Change the root in the command to your username, and you can change your password.
Of course, if your mysqladmin cannot connect to mysql server, or you cannot execute mysqladmin,
This method is invalid.
In addition, mysqladmin cannot clear the password.
The following methods are used at the mysql prompt and must have the root permission of mysql:
Method 3
Mysql> insert into mysql. user (Host, User, Password)
VALUES ('%', 'Jeffrey ', PASSWORD ('biscuit '));
Mysql> FLUSH PRIVILEGES
Specifically, this is adding a user with the username jeffrey and password biscuit.
I wrote this example in mysql Chinese reference manual.
Be sure to use the PASSWORD function, and then use flush privileges.
Method 4
Similar to method Sany, but the REPLACE statement is used.
Mysql> replace into mysql. user (Host, User, Password)
VALUES ('%', 'Jeffrey ', PASSWORD ('biscuit '));
Mysql> FLUSH PRIVILEGES
Method 5
Use the set password statement,
Mysql> set password for jeffrey @ "%" = PASSWORD ('biscuit ');
You must also use the PASSWORD () function,
However, you do not need to use flush privileges.
Method 6
Use the GRANT... identified by statement
Mysql> grant usage on *. * TO jeffrey @ "%" identified by 'biscuit ';
Here, the PASSWORD () function is unnecessary and does not need to be flush privileges.
Note: PASSWORD () [not] implements PASSWORD encryption in the same way as Unix PASSWORD encryption.
How to fix MySQL password loss
If MySQL is running, killall-TERM mysqld is first killed.
Start MySQL: bin/safe_mysqld -- skip-grant-tables &
You can access MySQL without a password.
Then
> Use mysql
> Update user set password = password ("new_pass") where user = "root ";
> Flush privileges;
Kill MySQL again and start MySQL in a normal way.