postgres@taurus:~/data> psql
Welcome to psql 8.2.4, the PostgreSQL interactive terminal.

Type:  \copyright for distribution terms
       \h for help with SQL commands
       \? for help with psql commands
       \g or terminate with semicolon to execute query
       \q to quit

postgres=#\du
                               List of roles
 Role name | Superuser | Create role | Create DB | Connections | Member of
-----------+-----------+-------------+-----------+-------------+-----------
 forum     | нет       | нет         | нет       | no limit    |
 postgres  | да        | да          | да        | no limit    |
 root      | да        | нет         | нет       | no limit    |
(3 rows)

postgres=# alter user postgres password 'postgres';
ALTER ROLE
postgres=#