sudo -u postgres /Library/PostgreSQL/11/bin/pg_ctl -D /Library/PostgreSQL/11/data start
sudo -u postgres /Library/PostgreSQL/11/bin/pg_ctl -D /Library/PostgreSQL/11/data stop
Linux Tutorial and something else…..
I don't know what's the matter with people: they don't learn by understanding, they learn by some other way — by rote or something. Their knowledge is so fragile! (Feynman)