cd /tmp

tar vxzf netcat_1.10.orig.tar.gz
cd netcat-1.10.orig/

zcat ../netcat_1.10-38.diff.gz | patch -p1

//Vi Makefile line 11

mv nc.exe /bin/
mv nc.1 /usr/share/man/man1/

nc -h

$ nc -h
connect to somewhere: nc [-options] hostname port[s] [ports] …
listen for inbound: nc -l -p port [-options] [hostname] [port]
-c shell commands as `-e’; use /bin/sh to exec [dangerous!!]
-e filename program to exec after connect [dangerous!!]
-b allow broadcasts
-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
-k set keepalive option on socket
-l listen mode, for inbound connects
-n numeric-only IP addresses, no DNS
-o file hex dump of traffic
-p port local port number
-r randomize local and remote ports
-q secs quit after EOF on stdin and delay of secs
-s addr local source address
-T tos set Type Of Service
-t answer TELNET negotiation
-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: lo-hi [inclusive];
hyphens in port names must be backslash escaped (e.g. ‘ftp\-data’).


nc -nvv 192.168.x.x 80

nc -l -p 1234 -c ‘tee 1234.txt | nc 192.168.x.x 22 | tee ssh.txt’
putty logon with localhost port 1234

nc -v -n -z -w1 192.168.x.x 1-65535
nc -nvv -w2 -z 192.168.x.x 80-445

HOSTA: nc -l -p 800 或 nc -l -p 800