install_postgis_osx.sh

# Some good references are:
# http://russbrooks.com/2010/11/25/install-postgresql-9-on-os-x
# http://www.paolocorti.net/2008/01/30/installing-postgis-on-ubuntu/
# http://postgis.refractions.net/documentation/manual-1.5/ch02.html#id2630392

#1. Install PostgreSQL postgis and postgres

#brew will install postgres and postgis using one formula
brew install postgis
initdb /usr/local/var/postgres
pg_ctl -D /usr/local/var/postgres -l /usr/local/var/postgres/server.log start

# if you dont have brew on your path yet
echo "export PATH=/usr/local/bin:$PATH" >> ~/.bash_profile
source ~/.bash_profile

#2. Create a template to be used on creating GIS-enabled databases

createdb postgis_template

#[Mac OSX] Import Postgis Data
psql -d postgis_template -f /usr/local/Cellar/postgis/2.1.2/share/postgis/postgis.sql
psql -d postgis_template -f /usr/local/Cellar/postgis/2.1.2/share/postgis/spatial_ref_sys.sql

#Test if works
psql -d postgis_template -c "SELECT postgis_full_version();"

#3. Set template permissions to gisgroup
createuser -R -S -L -D -I gisgroup;

psql -d postgis_template
ALTER DATABASE postgis_template OWNER TO gisgroup;
ALTER TABLE geometry_columns OWNER TO gisgroup;
ALTER TABLE spatial_ref_sys OWNER TO gisgroup;
CREATE SCHEMA gis_schema AUTHORIZATION gisgroup;
\q

#4. Adds an app to your application
createuser -i -l -S -R -d <app_user>

psql -d postgres
GRANT gisgroup TO <app_user>;
\q

#5. Create your app database
createdb -T postgis_template -O <app_user> <app_db>;

Still having problems with the two following errors:

typing "psql" returns

psql: FATAL:  database "robertbanick" does not exist

robertbanick being my computername in this instance

and initdb /usr/local/var/postgres returns

/usr/local/var/postgres" exists but is not empty
If you want to create a new database system, either remove or empty
the directory "/usr/local/var/postgres" or run initdb
with an argument other than "/usr/local/var/postgres"