public void runScript(List<String> args, File dir) throws IOException {

      ShellCommandExecutor shexec = 

              new ShellCommandExecutor(args.toArray(new String[0]), dir);

      shexec.execute();

      int exitCode = shexec.getExitCode();

      if (exitCode != 0) {

        throw new IOException("Task debug script exit with nonzero status of " 

                              + exitCode + ".");

      }

    }