MySQL root user password using MySQL sql command

This is another method. MySQL stores username and passwords in user table inside MySQL database. You can directly update password using the following method to update or change password for user vivek:
1) Login to mysql server, type following command at shell prompt:

$ mysql -u root -p

2) Use mysql database (type command at mysql> prompt):

mysql> use mysql;

3) Change password for user root:

mysql> update user set password=PASSWORD("NEWPASSWORD") where User='root';

4) Reload privileges:

mysql> flush privileges;
mysql> quit