Shell TCP Listener

continous-shell-tcp-listener.sh

#!/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

shell-tcp-listener.sh

# Create Listener (-l) that listens to Port (-p) 9999
nc -l -p 9999

# Run in infinite loop
while :; do nc -l -p 999; done