How to restart PostgreSQL server on MacOS?

Question

I tried the following and it failed

bash-3.2$ pg_ctl restart
pg_ctl: no database directory specified and environment variable PGDATA unset

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Answer 1

One liner (with default postgresSql 9.6 install)

sudo su postgres -c "/Library/PostgreSQL/9.6/bin/pg_ctl restart -D /Library/PostgreSQL/9.6/data"

Full version

Get the pgdata folder (gave me /Library/PostgreSQL/9.6/data) (thanks @a_horse_with_no_name)

select name, setting from pg_settings where name = 'data_directory';

For me it returns '/Library/PostgreSQL/9.6/data'

Then

sudo su - postgres
./bin/pg_ctl restart -D /Library/PostgreSQL/9.6/data

Note: postgres' user home dir should be "/Library/PostgreSQL/9.6"