http://www.computerhope.com/unix/nc.htm
小样
nc -v [-w timeout] [destination] [port]
[root@mmsi-02-238 app]# nc -v -w 10 172.16.50.238 9876
Connection to 172.16.50.238 9876 port [tcp/sd] succeeded! http://www.computerhope.com/unix/nc.htm
小样
nc -v [-w timeout] [destination] [port]
[root@mmsi-02-238 app]# nc -v -w 10 172.16.50.238 9876
Connection to 172.16.50.238 9876 port [tcp/sd] succeeded!