http://chriskief.com/2013/11/17/mavericks-macports-postgresql-9-tomcat-6-and-postgresql-studio/

postgresql.sh

# install and select
sudo port install postgresql93-server
sudo port select --set postgresql postgresql93

# load at startup
sudo port load postgresql93-server

# create the default database
sudo mkdir -p /opt/local/var/db/postgresql93/defaultdb
sudo chown postgres:postgres /opt/local/var/db/postgresql93/defaultdb
sudo su postgres -c '/opt/local/lib/postgresql93/bin/initdb -D /opt/local/var/db/postgresql93/defaultdb'

# create a new user (or you can simply use the default user postgres which does not require a password)
createuser --superuser your_username -U postgres -P

# create a new database
createdb database_name

Sorry, here is the updated file: https://gist.github.com/ChicagoDev/4d24fb081ddfd2110984