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MySQL User Password Changing

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[root@vps.net ~]# mysql -u root -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 467
Server version: 5.1.73 Source distribution

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Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> SET PASSWORD FOR 'db1_user'@'localhost' = PASSWORD('os_user_passwo3454rd_12_$@');
Query OK, 0 rows affected (0.00 sec)

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