java 执行command

　　　　　　StringBuffer buf = new StringBuffer(1000);
            try {
                Process pos = Runtime.getRuntime().exec("sh " + cmd);
                pos.waitFor();
                InputStreamReader ir = new InputStreamReader(pos.getInputStream());
                LineNumberReader input = new LineNumberReader(ir);
                String ln="";
                while ((ln =input.readLine()) != null) {
                    buf.append(ln+"<br>");
                }
                logger.info(buf.toString());
                input.close();
                ir.close();
            } catch (Exception e) {
                logger.error("###flush Kerberos command error:" + e);
            }