// Set the controller step offset to 2.0
var controller : CharacterController;
controller = GetComponent(CharacterController);
controller.stepOffset = 2.0;

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    public CharacterController controller;
    void Example() {
        controller = GetComponent<CharacterController>();
        controller.stepOffset = 2.0F;
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    public controller as CharacterController

    def Example():
        controller = GetComponent[of CharacterController]()
        controller.stepOffset = 2.0F