Unity3D Camera Shake using random.

RandomShake.cs

using UnityEngine;
using System.Collections;

public class RandomShake : MonoBehaviour {
  
	public float duration = 0.5f;
	public float magnitude = 0.1f;
	
	public bool test = false;
	
	// -------------------------------------------------------------------------
	public void PlayShake() {
		
		StopAllCoroutines();
		StartCoroutine("Shake");
	}
	
	// -------------------------------------------------------------------------
	void Update() {
		if (test) {
			test = false;
		}
	}
	
	// -------------------------------------------------------------------------
	IEnumerator Shake() {
		
		float elapsed = 0.0f;
		
		Vector3 originalCamPos = Camera.main.transform.position;
		
		while (elapsed < duration) {
			
			elapsed += Time.deltaTime;			
			
			float percentComplete = elapsed / duration;			
			float damper = 1.0f - Mathf.Clamp(4.0f * percentComplete - 3.0f, 0.0f, 1.0f);
			
			// map noise to [-1, 1]
			float x = Random.value * 2.0f - 1.0f;
			float y = Random.value * 2.0f - 1.0f;
			x *= magnitude * damper;
			y *= magnitude * damper;
			
			Camera.main.transform.position = new Vector3(x, y, originalCamPos.z);
				
			yield return null;
		}
		
		Camera.main.transform.position = originalCamPos;
	}
}