Netcat

nc的一些小功能集合

[v1.12 NT http://eternallybored.org/misc/netcat/]
connect to somewhere:   nc [-options] hostname port[s] [ports] ...
listen for inbound:     nc -l -p port [options] [hostname] [port]
options:
        -d              detach from console, background mode

        -e prog         inbound program to exec [dangerous!!]
        -g gateway      source-routing hop point[s], up to 8
        -G num          source-routing pointer: 4, 8, 12, ...
        -h              this cruft
        -i secs         delay interval for lines sent, ports scanned
        -l              listen mode, for inbound connects
        -L              listen harder, re-listen on socket close
        -n              numeric-only IP addresses, no DNS
        -o file         hex dump of traffic
        -p port         local port number
        -r              randomize local and remote ports
        -s addr         local source address
        -t              answer TELNET negotiation
        -c              send CRLF instead of just LF
        -u              UDP mode
        -v              verbose [use twice to be more verbose]
        -w secs         timeout for connects and final net reads
        -z              zero-I/O mode [used for scanning]
port numbers can be individual or ranges: m-n [inclusive]

1、一个简单的收发消息工具

Client1和Client2之间，Client1安装了nc，监听8888端口，Client2用telnet Client1的8888端口即可，口令都不需要，直接发送字符就可以聊，Client2打字时，Client1同步显示，Client1打字必须要发送出去后，Client2才收到，

Client1（ip：2.2.2.2，CentOS）：

nc -l 8888

 

Client2（Windows 10）：

telnet 2.2.2.2 8888

暂不支持中文，乱码！