how to change user privileges in mysql code example

Example 1: mysql add user with all privileges

CREATE USER 'newuser'@'localhost' IDENTIFIED BY 'password';
GRANT ALL PRIVILEGES ON * . * TO 'newuser'@'localhost';
FLUSH PRIVILEGES;

Example 2: mysql add user with all privileges

# First Login mysql shell..
sudo mysql -u root -p 
CREATE USER 'username'@'localhost' IDENTIFIED BY 'P4ssW0rd';
GRANT ALL PRIVILEGES ON *.* TO 'username'@'localhost';
FLUSH PRIVILEGES;