root@Ubuntu:~# mysqlshow
+--------------------+
|     Databases      |
+--------------------+
| information_schema |
| mysql              |
+--------------------+
root@Ubuntu:~# mysqlshow mysql
Database: mysql
+---------------------------+
|          Tables           |
+---------------------------+
| columns_priv              |
| db                        |
| func                      |
| help_category             |
| help_keyword              |
| help_relation             |
| help_topic                |
| host                      |
| proc                      |
| procs_priv                |
| tables_priv               |
| time_zone                 |
| time_zone_leap_second     |
| time_zone_name            |
| time_zone_transition      |
| time_zone_transition_type |
| user                      |
+---------------------------+
root@Ubuntu:~# mysql -e "SELECT Host,Db,User FROM db" mysql -u root
root@Ubuntu:~#