// Creates a Label and prints CapsLock on/off
// depending on the state of the capslock key.
function OnGUI() {
    var e : Event = Event.current;
    if (e.capsLock) {
        GUI.Label (Rect (10, 10, 100, 20), "CapsLock on.");
    } else {
        GUI.Label (Rect (10, 10, 100, 20), "CapsLock off.");
    }
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    void OnGUI() {
        Event e = Event.current;
        if (e.capsLock)
            GUI.Label(new Rect(10, 10, 100, 20), "CapsLock on.");
        else
            GUI.Label(new Rect(10, 10, 100, 20), "CapsLock off.");
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    def OnGUI():
        e as Event = Event.current
        if e.capsLock:
            GUI.Label(Rect(10, 10, 100, 20), 'CapsLock on.')
        else:
            GUI.Label(Rect(10, 10, 100, 20), 'CapsLock off.')