Start Postgresql:

sudo -u postgres /Library/Postgresql/9.6/bin/pg_ctl -D /Library/Postgresql/9.6/data start

Stop Postgresql:

sudo -u postgres /Library/Postgresql/9.6/bin/pg_ctl -D /Library/Postgresql/9.6/data stop

Stop Postgresql from auto-starting on reboot:

sudo launchctl unload -w /Library/LaunchDaemons/com.edb.launchd.postgresql-9.6.plist

Make Postgresql auto-start on reboot:

sudo launchctl load -w /Library/LaunchDaemons/com.edb.launchd.postgresql-9.6.plist

Mac启动时，不自动启动postgresql，也可以作为停止postgresql的命令：

sudo launchctl unload -w /Library/LaunchDaemons/com.edb.launchd.postgresql-9.6.plist

自动启动postgresql，也可以作为启动postgresql的命令：

sudo launchctl unload -w /Library/LaunchDaemons/com.edb.launchd.postgresql-9.6.plist