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mysql>select USER();
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mysql>use mysql;
mysql>select distinct(User) from user;
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mysql>select User,host from user;
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mysql>select user,host from mysql.user;
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mysql>select * from mysql.user;
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mysql>show grants for 'username'@'yourhost';
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mysql> GRANT ALL PRIVILEGES ON *.* TO root@localhost IDENTIFIED BY 'somepassword' WITH GRANT OPTION;
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mysql> GRANT ALL PRIVILEGES ON databasename.* TO username@localhost IDENTIFIED BY 'somepassword';
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mysql> GRANT ALL PRIVILEGES ON *.* TO username@192.168.8.9 IDENTIFIED BY 'somepassword';
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mysql> GRANT ALL PRIVILEGES ON *.* TO username@% IDENTIFIED BY 'somepassword';
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mysql> GRANT select,delete,insert,update ON databasename.* TO username@localhost IDENTIFIED BY 'somepassword';
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mysql>revoke all on *.* from username@localhost;
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mysql>DELETE from user WHERE User='user_name' and Host='host_name';
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