Linux NC command example

In the NC command in Linux,-l follows the listening port, and-P follows the local port used to establish a connection with the target host. The two cannot be used at the same time.

 

NC-l 1234

NC 127.0.0.1 1234
Establish a connection in Port 1234 and send input to each other

NC-P 1234-W 5 host.example.com 80
Establishes a port 80 connection from local port 1234 to host.example.com, and times out in 5 seconds.
NC-UHost.example.com 53
U is a UDP connection

Echo-n "Get/HTTP/1.0" R "N" R "N" | NC host.example.com 80
Connect to the host and execute

NC-V-ZHost.example.com 70-80
Scan port (70 to 80), which can be specified. -V: Output details.