Mac下多开Unity

[MenuItem("Tools/OpenUnity")]
public static void OpenUnity(){           
Process proc = new System.Diagnostics.Process ();  
 proc.StartInfo.FileName = "/bin/bash";  
proc.StartInfo.Arguments = "-c \" " + "open -na unity" + " \""; 
  proc.StartInfo.UseShellExecute = false;  
 proc.StartInfo.RedirectStandardOutput = true;  
 proc.Start ();
}