Unix : lost mysql root password

gistfile1.txt

/etc/init.d/mysql stop
echo "UPDATE mysql.user SET Password=PASSWORD('MyNewPass') WHERE User='root'; FLUSH PRIVILEGES;" >> /home/mysql-init
mysqld_safe --init-file=/home/mysql-init &
rm /home/mysql-init
/etc/init.d/mysql stop
/etc/init.d/mysql start

or

/etc/init.d/mysql stop
mysqld_safe --skip-grant-tables &
mysql -u root
(in mysql shell)
mysql> use mysql;
mysql> update user set password=PASSWORD("MyNewPass") where User='root';
mysql> flush privileges;
mysql> quit
/etc/init.d/mysql stop
/etc/init.d/mysql start