psql

createdb rpg_sheet -O rodrigondec
psql rpg_sheet
    \password


dropdb rpg_sheet

sudo pg_ctlcluster 9.6 main start
sudo pg_ctlcluster 9.6 main stop

sudo /etc/init.d/postgresql restart

disable service(not auto-start any more)
    sudo systemctl disable postgresql

enable service postgresql(auto-start)
    sudo systemctl enable postgresql