Event.control
var control: bool;
bool control;
control as bool
Description

Is Control key held down? (Read Only)

Returns true if any Control key is held down.
	// Detects if the control key was pressed
	function OnGUI() {
		var e : Event = Event.current;
		if (e.control) {
			Debug.Log("Control was pressed.");
		}
	}

using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    void OnGUI() {
        Event e = Event.current;
        if (e.control)
            Debug.Log("Control was pressed.");
        
    }
}

import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	def OnGUI() as void:
		e as Event = Event.current
		if e.control:
			Debug.Log('Control was pressed.')