-- List all available commands
\?
-- List all database schema
SELECT schema_name
FROM information_schema.schemata;
-- List all databases
\l
-- Switch database
\c
-- List all table in database
\dt
-- List all index
\di
-- List all users
\du
-- List all groups
\dg
-- Get commands historic
\s
-- Get postgresql settings
SELECT name, setting FROM pg_settings;