public void useLinuxCommond(){
		try {
			Process p = Runtime.getRuntime().exec("sudo ovs-vsctl show");  //调用Linux的相关命令
			
			InputStreamReader ir = new InputStreamReader(p.getInputStream());  
			LineNumberReader input = new LineNumberReader (ir);      //创建IO管道，准备输出命令执行后的显示内容
			
			 String line;  
			 while ((line = input.readLine ()) != null){     //按行打印输出内容
			  System.out.println(line);  
			}  
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

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