nc(netcat)被誉为网络工具中的“瑞士军刀”，体积虽小但功能强大，nc最简单的功能是端口扫描，这里我主要笔记一下它作为文件传输的妙用。
首先看一下帮助信息。
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$ nc -h
openbsd netcat (debian patchlevel 1.105-7ubuntu1)
this is nc from the netcat-openbsd package. an alternative nc is available
in the netcat-traditional package.
usage: nc [-46bcddhjklnrstuuvzz] [-i length] [-i interval] [-o length]
[-p proxy_username] [-p source_port] [-q seconds] [-s source]
[-t toskeyword] [-v rtable] [-w timeout] [-x proxy_protocol]
[-x proxy_address[:port]] [destination] [port]
command summary:
-4 use ipv4
-6 use ipv6
-b allow broadcast
-c send crlf as line-ending
-d enable the debug socket option
-d detach from stdin
-h this help text
-i length tcp receive buffer length
-i secs delay interval for lines sent, ports scanned
-j use jumbo frame
-k keep inbound sockets open for multiple connects
-l listen mode, for inbound connects
-n suppress name/port resolutions
-o length tcp send buffer length
-p proxyuser username for proxy authentication
-p port specify local port for remote connects
-q secs quit after eof on stdin and delay of secs
-r randomize remote ports
-s enable the tcp md5 signature option
-s addr local source address
-t toskeyword set ip type of service
-t answer telnet negotiation
-u use unix domain socket
-u udp mode
-v rtable specify alternate routing table
-v verbose
-w secs timeout for connects and final net reads
-x proto proxy protocol: "4", "5" (socks) or "connect"
-x addr[:port] specify proxy address and port
-z dccp mode
-z zero-i/o mode [used for scanning]
port numbers can be individual or ranges: lo-hi [inclusive]
端口扫描：
$ nc -z -v -n 127.0.0.1 20-100 ... connection to 127.0.0.1 80 port [tcp/*] succeeded! ...
简单文件传输：
客户端：
$ nc -l 192.168.1.11 1234 > passwd.txt &
服务端：
$ nc 192.168.1.11 1234 < /etc/passwd
也可以是
cat /etc/passwd | nc 192.168.1.11 1234
服务端ip是192.169.1.11，端口是1234
如此，当两台linux机器需要简单传输文件时，再好不过了～
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