postgres=# \du
                        List of roles
  Role name  |            Attributes             | Member of
-------------+-----------------------------------+-----------
[...]
 maguro      | Superuser                         | {}
[...]

postgres=# \l
                                      List of databases
      Name       |    Owner    | Encoding |   Collate   |    Ctype    |   Access privileges
-----------------+-------------+----------+-------------+-------------+-----------------------
 baculadir       | maguro      | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =Tc/maguro           +
                 |             |          |             |             | maguro=CTc/maguro
[...]