javaで外部プログラムを呼ぶ

ProcessBuilderで可能．
しかしリダイレクトができないらしいので，
シェルスクリプトにいろいろ書いて，それを呼び出すしかなさそう．

      String command = "my.sh";
      ProcessBuilder pb = new ProcessBuilder(command.split(" "));
      Process p = pb.start();
      BufferedReader br;
      br = new BufferedReader(new InputStreamReader(p.getInputStream()));
      String line;
      while ((line = br.readLine()) != null) {
        System.out.println(line);
      }
      br = new BufferedReader(new InputStreamReader(p.getErrorStream()));
      while ((line = br.readLine()) != null) {
        System.err.println(line);
      }
    } catch (IOException ex) {
      ex.printStackTrace();
    }