Where is the default config file and how to config it?

I copyed   surpport-files/my-medium.cnf to /etc/my.medim.cnf and its content is as follow:

[client]
#password       = your_password
port            = 3306
socket          = /tmp/mysql.sock

# Here follows entries for some specific programs

# The MySQL server
[mysqld]
port            = 3306
user =root
socket          = /tmp/mysql.sock
skip-locking
key_buffer = 16M
max_allowed_packet = 1M
table_cache = 64
sort_buffer_size = 512K
net_buffer_length = 8K
read_buffer_size = 256K
read_rnd_buffer_size = 512K
myisam_sort_buffer_size = 8M

Is anything wrong with it?
I have done the following steps to reset user "root"'s password:

# killall -TERM mysqld

#./bin/mysql_safe --skip-grant-tables&

#./mysql -u root
>use mysql;

>update user set password=password('the-new-password') where user='root';

>flush priviliges;

>quit;

But it didn't work. At first I could use #./bin/mysql_safe --skip-grant-tables&

and #./mysql -u root to enter into the command line environmeng of mysql ,
while the two commands doesn't take effect now. The response to #./bin/mysql_safe --skip-grant-tables& is like follows:
[root@nic219 mysql-standard-5.0.20-linux-i686]# bin/mysqld_safe --skip-grant-tables &
[1] 4542
[root@nic219 mysql-standard-5.0.20-linux-i686]# Starting mysqld daemon with databases from /home/ygx/mysql-standard-5.0.20-linux-i686 /data
STOPPING server from pid file /home/ygx/mysql-standard-5.0.20-linux-i686/data/nic219.pid
070129 15:40:21 mysqld ended

2007/1/29, A.L.M.Buxey@lboro.ac.uk <A.L.M.Buxey@lboro.ac.uk>:

Hi,

> But i couldn't use " mysql -u root -p rootpass" to enter the command line
> enviroment any longer. The output is :ERROR 1045 (28000): Access denied for
> user 'root'@'localhost' (using password: YES). Seems strange,isnt? Anyway, I
> might better re-install Mysql.

not strange at all - does that default config file have a root exclude or
a default password entry? have you installed or created the privileges table
(check the mysql table for user/password/host entries)

alan
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