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;
		}
	}
}

Nice script!

For anyone that wants it I made a version that allows you to skip frames to control how jerky the camera shake is, works on any gameObject, and lets you choose whether or not to run it whenever the script is enabled.

public class ObjectShaker : MonoBehaviour {

bool startOnEnable = true;
float shakeDuration = 1f;
float framesToSkip = 0f; //How many frames to we skip in order to slow down the jerkiness of the animation
public float shakeAmount = 1f;

void OnEnable()
{
    if(startOnEnable)
    {
        Shake();
    }
}

//Parameters are optional. Defaults to object variables.
public void Shake(float _duration = -1f, float _skip = -1f, float _amount = -1f)
{
    if(_duration < 0)
    {
        _duration = shakeDuration;
    }

    if(_skip < 0)
    {
        _skip = framesToSkip;
    }

    if(_amount < 0)
    {
        _amount = shakeAmount;
    }

    StartCoroutine(ShakeCoroutine(_duration, _skip, _amount));
}



IEnumerator ShakeCoroutine(float _duration, float _framesToSkip, float _amount)
{
  //For if you need special logic for Main Cameras (e.g. you have a script that follows the player around that you need to disable temporarily)
    if(gameObject.tag == "MainCamera")
    {
        //Disable here
    }

    Vector3 originalPos = transform.position;

    float currFramesSkipped = 0f;
    bool locked = true;

    while (_duration > 0)
    {
        if(currFramesSkipped <= _framesToSkip)
        {
            locked = true;
            currFramesSkipped += 1;
        } else
        {
            locked = false;
            currFramesSkipped = 0f;
        }

        if(!locked)
        {
            transform.position = originalPos + Random.insideUnitSphere * _amount;
        }
        
        _duration -= Time.deltaTime;
        yield return null;
    }

    //reenable your camera
    if (gameObject.tag == "MainCamera")
    {
        //reenable camera logic here
    }
    transform.position = originalPos;
}

}