runtime = Runtime.getRuntime();
      process = runtime.exec(cmdInstruction);
 
      in = new BufferedReader(new InputStreamReader(process.getInputStream()));
      err= new BufferedReader(new InputStreamReader(process.getErrorStream()));
 
      String buffer;
      while((buffer = err.readLine())!= null) {
        returnVal.append(buffer);
        returnVal.append("\n");
      }
 
      if (returnVal.length() != 0){
        return returnVal.insert(0,"Error:");
      }
 
      // the Success message from the OS is read into a buffer and returned
      while((buffer = in.readLine())!= null) {
        returnVal.append(buffer);
        returnVal.append("\n");
      }