MySQL Change root Password
How do I change MySQL root password under Linux, FreeBSD, OpenBSD and UNIX like operating system over ssh / telnet session?
Setting up MySQL password is one of the essential tasks. By default root user is MySQL admin account user. Please note that the Linux / UNIX root account for your operating system and MySQL root are different. They are separate and nothing to do with each other. Sometime your may remove mysql root account and setup admin as mysql super user for security purpose.
mysqladmin command to change root password
If you
have never set a root password for MySQL server, the server does not
require a password at all for connecting as root. To setup root password
for first time, use mysqladmin command at shell prompt as follows:
$ mysqladmin -u root password NEWPASSWORD
However, if you want to change (or update) a root password, then you need to use the following command:
$ mysqladmin -u root -p'oldpassword' password newpass
For example, If the old password is abc, you can set the new password to 123456, enter:
$ mysqladmin -u root -p'abc' password '123456'
Change MySQL password for other users
To change a normal user password you need to type (let us assume you would like to change password for user vivek) the following command:
$ mysqladmin -u vivek -p oldpassword password newpass
Changing 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 the 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 vivek, enter:
mysql> update user set password=PASSWORD("NEWPASSWORD") where User='vivek';
4) Finally, reload the privileges:
mysql> flush privileges; mysql> quit
The last method can be used with PHP, Python or Perl scripting mysql API.
picked from: http://www.cyberciti.biz/faq/mysql-change-root-password/