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查看MYSQL数据库中所有用户

mysql> SELECT DISTINCT CONCAT('User: ''',user,'''@''',host,''';') AS query FROM mysql.user;+---------------------------------------+| query                                 |+---------------------------------------+| User: 'cactiuser'@'%';                | | User: 'common_user'@'%';              | | User: 'dba'@'%';                      | | User: 'root'@'%';                     | | User: 'slave'@'%';                    | | User: 'wtgame'@'%';                   | | User: 'root'@'127.0.0.1';             | | User: 'webman'@'127.0.0.1';           | | User: 'root'@'192.168.166.200';       | | User: 'cactiuser'@'192.168.166.202';  | | User: 'root'@'192.168.166.202';       | | User: ''@'localhost';                 | | User: 'cacti'@'localhost';            | | User: 'cactiuser'@'localhost';        | | User: 'dba'@'localhost';              | | User: 'extmail'@'localhost';          | | User: 'javauser'@'localhost';         | | User: 'root'@'localhost';             | | User: 'webman'@'localhost';           | | User: ''@'localhost.localdomain';     | | User: 'root'@'localhost.localdomain'; | +---------------------------------------+21 rows in set (0.01 sec)

查看数据库中具体某个用户的权限

mysql> show grants for 'cactiuser'@'%';    +-------------------------------------------------------------------------------------------------------------------+| Grants for cactiuser@%                                                                                            |+-------------------------------------------------------------------------------------------------------------------+| GRANT PROCESS, SUPER ON *.* TO 'cactiuser'@'%' IDENTIFIED BY PASSWORD '*DAFF917B80E3314B1ABECBA9DF8785AFD342CE89' | | GRANT ALL PRIVILEGES ON `cacti`.* TO 'cactiuser'@'%'                                                              | +-------------------------------------------------------------------------------------------------------------------+2 rows in set (0.00 sec)

mysql> select * from mysql.user where user='cactiuser' \G   *************************** 1. row ***************************                 Host: %                 User: cactiuser             Password: *DAFF917B80E3314B1ABECBA9DF8785AFD342CE89          Select_priv: N          Insert_priv: N          Update_priv: N          Delete_priv: N          Create_priv: N            Drop_priv: N          Reload_priv: N        Shutdown_priv: N         Process_priv: Y            File_priv: N           Grant_priv: N      References_priv: N           Index_priv: N           Alter_priv: N         Show_db_priv: N           Super_priv: YCreate_tmp_table_priv: N     Lock_tables_priv: N         Execute_priv: N      Repl_slave_priv: N     Repl_client_priv: N     Create_view_priv: N       Show_view_priv: N  Create_routine_priv: N   Alter_routine_priv: N     Create_user_priv: N           Event_priv: N         Trigger_priv: N             ssl_type:            ssl_cipher:           x509_issuer:          x509_subject:         max_questions: 0          max_updates: 0      max_connections: 0 max_user_connections: 0

查看user表结构　需要具体的项可结合表结构来查询

mysql> desc mysql.user;+-----------------------+-----------------------------------+------+-----+---------+-------+| Field                 | Type                              | Null | Key | Default | Extra |+-----------------------+-----------------------------------+------+-----+---------+-------+| Host                  | char(60)                          | NO   | PRI |         |       | | User                  | char(16)                          | NO   | PRI |         |       | | Password              | char(41)                          | NO   |     |         |       | | Select_priv           | enum('N','Y')                     | NO   |     | N       |       | ************************************+-----------------------+-----------------------------------+------+-----+---------+-------+39 rows in set (0.00 sec)