$sudo systemctl start postgresql-9.4
Job for postgresql-9.4.service failed. See 'systemctl status postgresql-9.4.service' and 'journalctl -xn' for details.

-bash-4.2$ sudo systemctl start postgresql-9.4.service
[sudo] password for postgres:

$ postgres -D /usr/local/pgsql/data
bash: postgres: command not found..