function Update () {
print ("Camera moving at " + camera.velocity.magnitude + " m/s");
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
void Update() {
print("Camera moving at " + camera.velocity.magnitude + " m/s");
}
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

def Update():
print((('Camera moving at ' + camera.velocity.magnitude) + ' m/s'))