listen addresses

grep listen_addresses /etc/postgresql/*/main/postgresql.conf

listen_addresses = 'localhost' (Use * for listening on all addresses, review also pg_hba.conf configuration)

#listen_addresses = 'localhost' # what IP address(es) to listen on;

Example modification using sed

sed s/"#listen_addresses = 'localhost'"/"listen_addresses = '*'"/ /etc/postgresql/*/main/postgresql.conf