linux下mysql怎么删除用户权限？

mysql> REVOKE INSERT ON *.*

    -> FROM 'testUser'@'localhost';

Query OK, 0 rows affected (0.01 sec)

mysql> SHOW GRANTS FOR 'testUser'@'localhost';

+-----------------------------------------------------------------+

| Grants for testUser@localhost                                   |

+-----------------------------------------------------------------+

| GRANT SELECT ON *.* TO 'testUser'@'localhost' WITH GRANT OPTION |

+-----------------------------------------------------------------+

1 row in set (0.00 sec)