PostgreSQL: Create new User and Database

CreateNewUserAndDatabase.sh

# To create a new postgres database with a new user/password combination
# we first have to log in as the postgres user 
sudo su - postgres;

# now we are the "postgres" user which is allowed to create new database users
# we use the -P parameter to create a new user called "annie". Annie uses a password.
createuser -P annie;

# finally, we create Annie's database
createdb -O annie annies_database;

# in the end we exit the postgres user's shell and 
# we become ourselves again
exit;