How to change MySQL Password

root@srv:~# mysql -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 14 to server version: 5.0.24a-Debian_9ubuntu2.4-log

Type ‘help;’ or ‘h’ for help. Type ‘c’ to clear the buffer.

mysql> GRANT ALL ON *.* TO root@’%’ IDENTIFIED BY ‘password_you_want’;
Query OK, 0 rows affected (0.00 sec)