SHELL

linux get port usage

# Linux (tested on Kali & Ubuntu)
sudo ss -tulpn | grep LISTEN

open port on linux

sudo ufw allow <PORT_NUMBER>

port running linux

sudo lsof +M -i4

used port linux

# Linux
ss -ltn

# windows
netstat -a -p -n tcp | findstr LISTENING

# SOURCE 
https://solace.community/discussion/26/how-to-find-a-free-tcp-port-for-testing-pubsub-with-docker

what com port linux

dmesg | grep tty

used ports in linux

# To check the listening ports and applications on Linux
# Use any of the following command on terminal

sudo lsof -i -P -n | grep LISTEN 

sudo netstat -tulpn | grep LISTEN

sudo lsof -i:80 # see a specific port such as 80

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Linux port

# to kill port 80 simply use
sudo fuser 80/tcp -k

port running linux

sudo nmap -T Aggressive -A -v 127.0.0.1 -p 1-65000