How to change your mysql root user password?

How can we update mysql root user password in command line using putty or command shell?

To update the mysql root user password you will need to follow below steps and it will be updated without any problem.

1- First stop the mysql server 

sudo /etc/init.d/mysql stop

2- Now run command to start mysqld configuration

sudo mysqld --skip-grant-tables &  

Don't forget & sign at the end

In some cases you will need to create /var/run/mysqld  first

sudo mkdir -v /var/run/mysqld && sudo chown mysql /var/run/mysqld

3- Start mysql service

sudo service mysql start

4- Login to mysql as a root user

mysql -u root mysql

5- Run below commands

UPDATE mysql.user SET Password = PASSWORD('yourpassword') WHERE User = 'root';

In some cases you will get 'password' unknown column then try below:

UPDATE user SET authentication_string=password('yourpassword') WHERE user='root';

FLUSH PRIVILEGES;
exit;

After going through all the above steps root user's password will get updated and you can test by login to mysql as root user with the updated password.