function Update () {
    var r : Rect = camera.pixelRect;
    print ("Camera displays from " + r.xMin + " to " + r.xMax + " pixel");
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    void Update() {
        Rect r = camera.pixelRect;
        print("Camera displays from " + r.xMin + " to " + r.xMax + " pixel");
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    def Update():
        r as Rect = camera.pixelRect
        print((((('Camera displays from ' + r.xMin) + ' to ') + r.xMax) + ' pixel'))