Command Line Arguments - Unity

CLIArguments.cs

using UnityEngine;
using System;

public class CLIArguments : MonoBehaviour
{
    static string cliString = "";

    void Start()
    {
        string[] arguments = Environment.GetCommandLineArgs();
        foreach (string arg in arguments)
        {
            cliString += arg.ToString() + "\n ";
        }
    }

    void OnGUI()
    {
        GUI.Label(new Rect(5, 5, 800, 500), cliString);
    }
}

CLIArguments.md

Windows PowerShell

.\game.exe --args -args2 arg3 arg4

Mac OS

 open game.app/ --args -args2 arg3 arg4