Java中调用windows命令，可以一次性执行多个命令。稍微改一下，也可以执行Linux l命令或shell脚本。

public class RuntimeTask {

	public static void main(String[] args) {
		Process process;
		//一次性执行多个命令
		String cmd = "cmd /c \"E: && dir && cd gitBackup && dir && pullAll.bat\"";

		try {
			Runtime runtime = Runtime.getRuntime();

			System.out.println("开始执行。。。");
			process = runtime.exec(cmd);

			//打印执行的输出结果
			InputStream is = process.getInputStream();
			InputStreamReader isr = new InputStreamReader(is, "gbk"); //gbk：解决输出乱码
			BufferedReader br = new BufferedReader(isr);
			String line;
			while ((line = br.readLine()) != null){
				System.out.println(line);
			}

			is.close();
			isr.close();
			br.close();
		}catch (IOException e){
			e.printStackTrace();
		}
	}
}