Using script's method from all of the gameobjects that has that script

Questions & Answers
1

The name pretty much says it all. I need to run one method from a script in all gameobjects that have that script in them(if this changes anything: I need to make this work from an RPC). How could I do that?

P.s. C# only please

2

There are several ways to do this!
In my opinion the most beautiful way to do this would be to make a manager.
Make a script called MyScriptManager.cs

using UnityEngine;
using System.Collections;

public class MyScriptManager: MonoBehaviour
{
 public static List<MonoBehaviour> myScripts = new List<MonoBehaviour>();

 public static void AddNewEntry(MonoBehaviour mono)
 {
  if(mono!=null)
   list.add(mono);
 }
...
}

You may have to add using System.Collections.Generic;

Afterwards you can add to your Script:

using UnityEngine;
using System.Collections;

public class MyScript: MonoBehaviour
{
...
 void Awake()
 {
  MyScriptManager.AddNewEntry(this);
 }
}

And whenever you want to call the function on all Scripts use this in your MyScript class:

void Update()
{
 if(something)
 {
  foreach(MonoBehaviour mono in MyScriptManager.myScripts)
  {
   ((MyScript)mono).callAwesomeFunction();
  }
 }
}

You may can’t copy + paste because I wrote it without compiler!
Hope this solves your problem!

3

There are several scenarios. It is unclear about what you really wanna do. But if I undestand you correctly then you could use [script made by Cerebrate][1]

Simple example of usage:

public interface ICanDoSomeAction
{
    void SomeAction(); 
}

class Digger : MonoBehaviour,ICanDoSomeAction
{
    public void SomeAction()
    {
        Dig();
    }

    private void Dig()
    {
        Debug.Log(gameObject.name + " digs");       
    }
}

class Archer : MonoBehaviour,ICanDoSomeAction
{
    public void SomeAction()
    {
        Shoot();
    }

    private void Shoot()
    {
        Debug.Log(gameObject.name + " make  a shot");       
    }
}

class Manager:MonoBehaviour
{
    public GameObject[] Actors;
    private ICanDoSomeAction[] actions;

    public 
    void Start()
    {
        actions = new ICanDoSomeAction[Actors.Length];
        for (int i = 0; i < Actors.Length; i++)
        {
            actions  _= Actors *.GetInterface<ICanDoSomeAction>();*_

}

}

void Update()
{
foreach (var a in actions)
a.SomeAction();
}
}
_*[1]: http://forum.unity3d.com/threads/how-to-get-all-components-on-an-object-that-implement-an-interface.101028/*_