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http://www.3d308.cn/article.asp?id=37
shell> mysql -u root mysql
mysql> Update user SET Password=PASSWORD('new_password')
Where user='root';
mysql> FLUSH PRIVILEGES;
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Enter password: **********
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 12 to server version: 5.0.22-community-nt-log
Type 'help;' or '\h' for help. Type ' ......