[CentOS] Problems with MySQL

[Tom Brown]

> mysql> set password for gamito at localhost=password('blabla');
> 
> but i always get the error:
> ERROR 1133 (42000): Can't find any matching row in the user table

mysql> set password for 'bar'@'localhost' = password ('baz');
Query OK, 0 rows affected (0.04 sec)

mysql>