nc命令官方的几个Demo实例

int32位 posted @ Mar 22, 2016 03:58:54 PM in linux , 2466 阅读
转载请注明:http://krystism.is-programmer.com/若有错误,请多多指正,谢谢!

 

nc命令可用于发送任务tcp/udp连接和监听.

官方描述的主要功能包括:

  • simple TCP proxies
  • shell-script based HTTP clients and servers
  • network daemon testing
  • a SOCKS or HTTP ProxyCommand for ssh(1)
  • and much, much more

下面看看官方的几个例子:

1. p2p简单聊天工具

在A机器运行(假设A机器主机名为node1:

nc -l 1234 # -l表示监听

在B机器运行:

nc node1 1234

此时从A或者B机器输入任何信息,都会在对方的机器中回显,实现了简单的即时聊天工具.

2. 文件传输

假设B机器有一个文件data.txt,需要传输到A机器:

在A机器:

nc -l 1234 >data.txt # data.txt需要保存的目标文件名

在B机器:

nc node1 1234 <data.txt # data.txt需要传输的文件

3.远程操作(类似ssh)

假设B需要远程操作A,又没有安装ssh:

在A机器:

rm -f /tmp/f; mkfifo /tmp/f
cat /tmp/f | /bin/sh -i 2>&1 | nc -l 127.0.0.1 1234 > /tmp/f

在B机器:

nc node1 1234

4.发送HTTP请求

echo "GET / HTTP/1.0\r\n\r\n" | nc localhost 80

5.端口扫描

# 查看主机名为node1的80端口是否开放
nc -zv node1 80
# 扫描主机名为node1的1~1024哪些端口是开放的
nc -zc node1 1-1024

 

转载请注明:http://krystism.is-programmer.com/若有错误,请多多指正,谢谢!
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