Continuously listen to tcp port via terminal

Question

Is it possible to listen to a port continuously?

I listen for incoming tcp notifications with following command

sudo nc -l -p 999

But as soon as notification arrives I have to restart listen with same command. Is it possible to listen to port without having to restart command when notifications arrives until user decides to abort listen?

Answer 1

Sorta outdated question, but came up first on my Google search.

In order for netcat not to shutdown as soon as the first connection is received, you can add the -k option.

From the man:

-k Forces nc to stay listening for another connection after its current connection is completed. It is an error to use this option without the -l option.

Src: https://superuser.com/a/708133/410908

Answer 2

Solved with a simple bash script

#!/bin/bash

#Make Sure Script Is Ran As Root
if [ $(id -u) != 0 ]; then
    echo; echo -e "\e[1;31mScript must be run as sudo. Please Type \"sudo\" To Run As Root \e[0m"; echo    
exit 1
fi

echo "Enter port to listen"
read portL

while true;
do
    nc -l -p $portL
done
exit 0

Thanks dreamlax for the tip!