MySQL 8 change password strengh in mysql console

MySQL8_PasswordStrength_CLI.txt

// 1 - Enter in mysql console
$ mysql -u root

// 1.1 (optional) - if you can't login into mysql console add this in [mysqld] section in your my.cnf file (/etc/mysql/my.cnf): 
skip-grant-tables

// 2 - See your password strength
mysql> SHOW VARIABLES LIKE 'validate_password%';

// your output will be something like this:
+--------------------------------------+--------+
| Variable_name                        | Value  |
+--------------------------------------+--------+
| validate_password_check_user_name    | OFF    |
| validate_password_dictionary_file    |        |
| validate_password_length             | 8      |
| validate_password_mixed_case_count   | 1      |
| validate_password_number_count       | 1      |
| validate_password_policy             | MEDIUM |
| validate_password_special_char_count | 1      |
+--------------------------------------+--------+
7 rows in set (0.01 sec)

// 3 - Paste this cli's to change security strength

mysql> SET GLOBAL validate_password.length = 4;
mysql> SET GLOBAL validate_password.policy = low;
mysql> SET GLOBAL validate_password.mixed_case_count = 0;
mysql> SET GLOBAL validate_password.number_count = 0;
mysql> SET GLOBAL validate_password.special_char_count = 0;
mysql> SET GLOBAL validate_password.check_user_name = 0;

mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'root';
//or 
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'pass';

mysql> FLUSH PRIVILEGES;
// 4 - Finally, exit mysql console (CTRL+D), and restart your mysql service
$ sudo service mysql restart