docker exec -it postgres su - postgres -c psql
docker exec -it postgres su - postgres -c "psql postgresql://${USERNAME}:${PASSWD}@${SERVERIP}/${DBNAME}"what is the tagline?
docker exec -it postgres su - postgres -c psql
docker exec -it postgres su - postgres -c "psql postgresql://${USERNAME}:${PASSWD}@${SERVERIP}/${DBNAME}"