I had to change my mysql root password for one of the servers since during the install I mispasted the password in the MySQL password prompt I needed the pwd to be changed.
Here is how I changed it to my desired one:
linux:~# /usr/bin/mysqladmin -u root -p'OLD_PASSWORD_STRING' password NEW_PASSWORD_STRING
The password gets changed immediately
If a new password has to be set to a passwordless mysql server, the command to be issued is:
linux:~# /usr/bin/mysqladmin -u root password PASSWORD_STRING
Changing the MySQL password is also possible with mysql cli, after connecting to the sql server, though this method is a bit more time consuming. Here is how to do it from mysql console:
linux:~# mysql -u root -p
Server version: 5.1.49-3 (Debian)
Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
This software comes with ABSOLUTELY NO WARRANTY. This is free software,
and you are welcome to modify and redistribute it under the GPL v2 license
Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.
mysql> use mysql;
mysql> update user set password=PASSWORD("NEW_PASSWORD") where User='root';mysql> flush privileges;
Of course it's possible to do change the root pass via phpmyadmin
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