java执行linux报错

1.首先确认一下：linux命令的正确性；
2. /opt/parser/standalone/log/server.log.2015-09-24等 中是否有需要转义的特殊字符。
用下面的代码测试时正确的

 Runtime runtime = Runtime.getRuntime();
        Process process = null;
        BufferedReader reader = null;
        String command = "cat /opt/test.txt |grep \"test\"";
        try {
            process = runtime.exec(command);
            int retCode = process.waitFor();
            reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
            System.out.println("oooo" + reader.readLine());