ContextMenuExample.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

namespace UnityAttributesExample {

    public class ContextMenuExample : MonoBehaviour {

        // The ContextMenu attribute allows you to add commands to the context menu.
        // In the inspector of the attached script.
        // When the user selects the context menu, the function will be executed.
        // This is most useful for automatically setting up Scene data from the script.
        // The function has to be non-static.

        // Add a context menu named "Do Something" in the inspector of the attached script.

        [ContextMenu("Do Something")]
        void DoSomething() {
            Debug.Log("Perform operation");
        }

    }

}