access and kill process at a certain port ubuntu code example

Example 1: kill 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)"