postgres=> \du  
                                        List of roles  
 Role name |                         Attributes                         |      Member of        
-----------+------------------------------------------------------------+---------------------  
 abc       | Cannot login                                               | {}  
 d         | Cannot login                                               | {}  
 postgres  | Superuser, Create role, Create DB, Replication, Bypass RLS | {}  
 ro        |                                                            | {pg_read_all_data}  
 rw        |                                                            | {pg_write_all_data}  
  
postgres=> \db  
       List of tablespaces  
    Name    |  Owner   | Location   
------------+----------+----------  
 pg_default | postgres |   
 pg_global  | postgres |   
(2 rows)  
  
postgres=> \l  
                             List of databases  
   Name    |  Owner   | Encoding | Collate | Ctype |   Access privileges     
-----------+----------+----------+---------+-------+-----------------------  
 postgres  | postgres | UTF8     | C       | en_US |   
 template0 | postgres | UTF8     | C       | en_US | =c/postgres          +  
           |          |          |         |       | postgres=CTc/postgres  
 template1 | postgres | UTF8     | C       | en_US | =c/postgres          +  
           |          |          |         |       | postgres=CTc/postgres  
(3 rows)  
  
postgres=> \dp+  
                                     Access privileges  
 Schema |      Name      | Type  |     Access privileges     | Column privileges | Policies   
--------+----------------+-------+---------------------------+-------------------+----------  
 public | a              | table |                           |                   |   
 public | b              | table |                           |                   |   
 public | c              | table |                           |                   |   
 public | comments       | table |                           |                   |   
 public | pg_buffercache | view  | postgres=arwdDxt/postgres+|                   |   
        |                |       | pg_monitor=r/postgres     |                   |   
 public | posts          | table |                           |                   |   
 public | t              | table |                           |                   |   
(7 rows)  
  
postgres=> \dx  
                      List of installed extensions  
      Name      | Version |   Schema   |           Description             
----------------+---------+------------+---------------------------------  
 pg_buffercache | 1.3     | public     | examine the shared buffer cache  
 pgcrypto       | 1.3     | public     | cryptographic functions  
 plpgsql        | 1.0     | pg_catalog | PL/pgSQL procedural language  
 roaringbitmap  | 0.5     | public     | support for Roaring Bitmaps  
(4 rows)