Simple camera shake effect for Unity3d, written in C#. Attach to your camera GameObject. To shake the camera, set shakeDuration to the number of seconds it should shake for. It will start shaking if it is enabled.

CameraShake.cs

using UnityEngine;
using System.Collections;

public class CameraShake : MonoBehaviour
{
	// Transform of the camera to shake. Grabs the gameObject's transform
	// if null.
	public Transform camTransform;
	
	// How long the object should shake for.
	public float shakeDuration = 0f;
	
	// Amplitude of the shake. A larger value shakes the camera harder.
	public float shakeAmount = 0.7f;
	public float decreaseFactor = 1.0f;
	
	Vector3 originalPos;
	
	void Awake()
	{
		if (camTransform == null)
		{
			camTransform = GetComponent(typeof(Transform)) as Transform;
		}
	}
	
	void OnEnable()
	{
		originalPos = camTransform.localPosition;
	}

	void Update()
	{
		if (shakeDuration > 0)
		{
			camTransform.localPosition = originalPos + Random.insideUnitSphere * shakeAmount;
			
			shakeDuration -= Time.deltaTime * decreaseFactor;
		}
		else
		{
			shakeDuration = 0f;
			camTransform.localPosition = originalPos;
		}
	}
}