Are you struggling shutting down your postgres ?
You are not alone. It took me only 30 minutes to find the the way out.
I know that I will forget the same in the future, or anyone else having the same question then you must read this.
Open Terminal command and run:
> vi ~/.bash_profile
copy and paste this command:
> alias postgres.server="sudo -u postgres /Library/PostgreSQL/9.4/bin/pg_ctl -D /Library/PostgreSQL/9.4/data"
PS: replace 9.4 with the PostgreSQL version that you are running.
> source ~/.bash_profile
Now you should be able to command the following:
> postgres.server start
> postgres.server stop
PS: You may need to enter admin password as you are starting or shutting down the sever for all user (hopefully its only you for your machine :-) ).