Create Postgress Database through Shell

create-postgres-database.sh

#!/bin/bash
username=$1
password=$2

if [[ ! $2 ]]; then
        read -sp "Password for $1: " password 
        echo
fi

if [[ $3 ]]; then
        database=$3
else
        database=$1
fi

if [[ ! $username && ! $password ]]; then
        echo "Usage: $0 username password databasename"
        echo "       - databasename is optional defaults to username"
        exit 1
fi

read -p "Creating database $database for $username: " answer

if [[ $answer == "y" || $answer == 'yes' ]]; then
        echo "Creating database $database"
        psql postgres -c "CREATE DATABASE $database"
        psql postgres -c "CREATE USER $username WITH PASSWORD '$password'"
        psql postgres -c "GRANT ALL PRIVILEGES ON DATABASE $database to $username"
        echo "Finished ..."
else
        exit 0
fi