var speed : float = 3.0;
var rotateSpeed : float = 3.0;

function Update () {
    var controller : CharacterController = GetComponent(CharacterController);

    // Rotate around y - axis
    transform.Rotate(0, Input.GetAxis ("Horizontal") * rotateSpeed, 0);
    
    // Move forward / backward
    var forward : Vector3 = transform.TransformDirection(Vector3.forward);
    var curSpeed : float = speed * Input.GetAxis ("Vertical");
    controller.SimpleMove(forward * curSpeed);
}

@script RequireComponent(CharacterController)

using UnityEngine;
using System.Collections;

[RequireComponent(typeof(CharacterController))]
public class example : MonoBehaviour {
    public float speed = 3.0F;
    public float rotateSpeed = 3.0F;
    void Update() {
        CharacterController controller = GetComponent<CharacterController>();
        transform.Rotate(0, Input.GetAxis("Horizontal") * rotateSpeed, 0);
        Vector3 forward = transform.TransformDirection(Vector3.forward);
        float curSpeed = speed * Input.GetAxis("Vertical");
        controller.SimpleMove(forward * curSpeed);
    }
}

import UnityEngine
import System.Collections

[RequireComponent(CharacterController)]
class example(MonoBehaviour):

    public speed as single = 3.0F

    public rotateSpeed as single = 3.0F

    def Update():
        controller as CharacterController = GetComponent[of CharacterController]()
        transform.Rotate(0, (Input.GetAxis('Horizontal') * rotateSpeed), 0)
        forward as Vector3 = transform.TransformDirection(Vector3.forward)
        curSpeed as single = (speed * Input.GetAxis('Vertical'))
        controller.SimpleMove((forward * curSpeed))