Event.shift

Description

Is Shift held down? (Read Only)

Returns true if any Shift key is held down.

	// Detects if the shift key was pressed
	function OnGUI() {
		var e : Event = Event.current;
		if (e.shift) {
			Debug.Log("Shift was pressed :O");
		}
	}

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    void OnGUI() {
        Event e = Event.current;
        if (e.shift)
            Debug.Log("Shift was pressed :O");
        
    }
}