reset mysql root user (Mac OS 10.9)

completely stop mysql server
sudo /usr/local/mysql/support-files/mysql.server stop

 use sql with safe mode and change password

sudo mysqld_safe --skip-grant-tables &

 log in
mysql -u root
use mysql;

update user set password=PASSWORD("xxxx") where User='root';
flush privileges;
quit


start mysql server
sudo /usr/local/mysql/support-files/mysql.server start

log in
mysql -u root -p
check users
select * from mysql.user;