Linux下修改MySQL用户root的密码
装完ubuntu server-11.04忘记刚刚设计的密码，于是就在网上找了解决方案。
以下为操作全过程

sudo /etc/init.d/mysql stop

Rather than invoking init scripts through /etc/init.d, use the service(8)
utility, e.g. service mysql stop
Since the script you are attempting to invoke has been converted to an
Upstart job, you may also use the stop(8) utility, e.g. stop mysql
mysql stop/waiting

sudo mysqld_safe --skip-grant-tables &

[1] 10528
cy@ubuntu://$ 110617 17:43:59 mysqld_safe Logging to syslog.
110617 17:43:59 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql

mysql mysql

Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.1.54-1ubuntu4 (Ubuntu)
Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
This software comes with ABSOLUTELY NO WARRANTY. This is free software,
and you are welcome to modify and redistribute it under the GPL v2 license
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql>

update user set password=password('111111') where user='root';

Query OK, 3 rows affected (0.00 sec)
Rows matched: 3  Changed: 3  Warnings: 0
mysql>

flush privileges;

Query OK, 0 rows affected (0.00 sec)
mysql>

quit

Bye

sudo killall mysqld

cy@ubuntu://$ 110617 17:45:35 mysqld_safe mysqld from pid file /var/lib/mysql/ubuntu.pid ended
[1]+  完成                    sudo mysqld_safe --skip-grant-tables

sudo /etc/init.d/mysql start

Rather than invoking init scripts through /etc/init.d, use the service(8)
utility, e.g. service mysql start
Since the script you are attempting to invoke has been converted to an
Upstart job, you may also use the start(8) utility, e.g. start mysql
mysql start/running, process 10681

mysql -uroot -p111111

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 43
Server version: 5.1.54-1ubuntu4 (Ubuntu)
Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
This software comes with ABSOLUTELY NO WARRANTY. This is free software,
and you are welcome to modify and redistribute it under the GPL v2 license
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql>