how to end activity on specific port linux code example

Example 1: kill process at a port ubuntu

sudo kill -9 $(sudo lsof -t -i:9001)

Example 2: kill a port in ubuntu

kill -9 $(sudo lsof -t -i:'portName')
//Ex. if portname is 3000
//then we will execute "kill -9 $(sudo lsof -t -i:3000)"

Example 3: ubuntu kill process on a port

sudo kill -9 $(sudo lsof -t -i:4000)

Example 4: stop a process running on a port ubuntu

sudo kill -9 `sudo lsof -t -i:9001`