execute sys command

using UnityEngine;
using System.Collections;
using System.IO;

public class ExecuteCommand : MonoBehaviour
{
 
  void Start ()
  {
    //string path = Directory.GetCurrentDirectory();
    string cmd = "git";
    string args = "diff Assets/Ammo/CannonBall.prefab";
    string result = Command(cmd, args);
    Debug.Log(result);
  }

  public string Command (string command, string args)
  {
    System.Diagnostics.ProcessStartInfo procStartInfo =
         new System.Diagnostics.ProcessStartInfo (command, args);
    procStartInfo.RedirectStandardOutput = true;
    procStartInfo.UseShellExecute = false;
    procStartInfo.CreateNoWindow = true;
    System.Diagnostics.Process proc = new System.Diagnostics.Process ();
    proc.StartInfo = procStartInfo;
    proc.Start();
    string result = proc.StandardOutput.ReadToEnd();
    return result;
  }
  
}