Running shell scripts Mac: POST BUILD

Hello, I have recently been working on a small Unity project. I have got everything working in the editor, however what seems not to be working is when I have built my app and any process that requires this code doesn't work, I am not too sure why. Any fixes?

 void Start () {
     ProcessStartInfo psi = new ProcessStartInfo(); 
     psi.FileName = Application.dataPath+"/MyShell.command";
     psi.UseShellExecute = false; 
     psi.RedirectStandardOutput = true;
     psi.Arguments = "";

     //All Arguments get passed but be careful, return data back in one ECHO!!!!!

     //psi.Arguments = "test"; 
     Process p = Process.Start(psi); 
     string strOutput = p.StandardOutput.ReadToEnd(); 
     p.WaitForExit(); 
     UnityEngine.Debug.Log(strOutput);
 }