Linux NC Commands

First, Introduction

NetCat, a "Swiss Army Knife" in Web tools, has a version of Windows and Linux. Because it is short and short (the 1.84 version is 25k, the old version or the reduced version is even smaller), functional, is designed as a simple, reliable network tool, can transmit read and write data through TCP or UDP protocol. At the same time, it is a network application debug parser, because it can create a variety of different types of network connections as needed.

Second, the grammar

NC [-hlnruz][-g< Gateway ...>][-g< number of points >][-i< delay seconds >][-o< output file >][-p< communication port >][-s< Source address >][ -V ...] [-W< timeout of seconds;] [Host name] [Communication port ...]

-g< Gateway >-g< number of points >-H  -i< delay seconds >-l  -N   -o< output file >-p< Communication port >-R  -s< Source Address >-  U  -v Verbose output--with two--w< timeout seconds >-Z  uses 0 in/out mode, only used when scanning communication ports.

Iii. Examples of application

Example 1: Port scan

Nc-v-w2192.168. 2.34 -

Example 2: File copy (from 192.168.2.33 copy files to 192.168.2.34)

In the 192. 168.2 1234 > test.txt in 192. 168.2 192.168. 2.34 < Test.txt

Example 3: Simple Chat

In the 192. 168.2 1234 in 192. 168.2 192.168. 2.34 1234 in this way, the two sides can communicate with each other. Use CTRL+c (or D) to exit.

Example 4: Remote execution (connect to host and execute)

Echo " get/http/1.0 "r"n"r"n"

Example 5: Remote connection (establish 80-port connection from local 1234 port to host.example.com, 5-second timeout)

1234 -w5

Linux NC Commands