close an app that use a specific port linux code example

Example 1: kill port linux

kill -9 $(lsof -t -i:8080)

Example 2: kill process on port

#list process running on specified port (here 80, change to your port)
sudo lsof -i:80

#kill process on specified port (here 80, change to your port)
sudo kill $(sudo lsof -t -i:80)