How to update the user or anyonymous password in MySQL

How to Change password with mysqladmin

mysqladmin - u root - p password "new password"

Change your password to pwd5 for the user account under which you're currently logged on to the system
SET PASSWORD = PASSWORD('pwd5'); 

Connect to the server at a specific IP address, with a username of myname and password of mypass:

shell> mysql host=192.168.1.33 user=myname password=mypass

shell> mysqladmin -u root password 'rootpass'

shell> mysqladmin -u root -h host_name password 'rootpass'

shell> mysql -u root mysql

If you want to assign passwords to the anonymous accounts

UPDATE user SET Password = PASSWORD('anonpass') WHERE User = '';

UPDATE user SET Password = PASSWORD('rootpass') WHERE User = '' AND Host = 'localhost';