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[root@test1 local]# /usr/bin/mysqladmin -u root password 123456
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    [root@test1 local]# mysql
    ERROR 1045: Access denied for user: 'root@localhost' (Using password: NO)   ÏÔʾ´íÎó£¬ËµÃ÷ÃÜÂëÒѾ­Ð޸ġ£
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    [root@test1 local]# mysql -u root -p
    Enter password: (ÊäÈëÐ޸ĺóµÄÃÜÂë123456)
    Welcome to the MySQL monitor. Commands end with ; or \g.
    Your MySQL connection id is 4 to server version: 4.0.16-standard
    Type 'help;' or '\h' for help. Type '\c' to clear the buffer.
     mysql>
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