你可以按照以下简单的五步来重置
/etc/init.d/mysql stop
输出：
Stopping MySQL database server: mysqld.
/usr/bin/mysqld_safe --skip-grant-tables &
输出：
[1] 5988
Starting mysqld daemon with databases from /var/lib/mysql
mysqld_safe[6025]: started
mysql -u root
输出：
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1 to server version: 4.1.15-Debian_1-log
Type ‘help;’ or ‘\h’ for help. Type ‘\c’ to clear the buffer.
mysql>
mysql> use mysql;
mysql> update user set Password=PASSWORD("输新root密码") where User='root';
mysql> flush privileges;
mysql> quit
/etc/init.d/mysql stop
输出：
Stopping MySQL database server: mysqld
STOPPING server from pid file /var/run/mysqld/mysqld.pid
mysqld_safe[6186]: ended
[1]+ Done mysqld_safe –skip-grant-tables
/etc/init.d/mysql start
mysql -u root -p
