how to change password of root in mysql code example

Example 1: enable password in mysql root user in mysql 8

1. If you in skip-grant-tables mode in mysqld_safe:

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

and then, in terminal:

$ mysql -u root

in mysql:
mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH caching_sha2_password BY 'yourpasswd';


2. Not in skip-grant-tables mode just in mysql:
mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH caching_sha2_password BY 'yourpasswd';

Example 2: what is default mysql database password in linux

$ sudo apt install mysql-server
$ sudo cat /etc/mysql/debian.cnf