kill a port in ubuntu

sudo kill -9 `sudo lsof -t -i:9001`
kill -9 $(sudo lsof -t -i:'portName')
//Ex. if portname is 3000
//then we will execute "kill -9 $(sudo lsof -t -i:3000)"sudo kill -9 `sudo lsof -t -i:9001`sudo kill -9 `sudo lsof -t -i:3002`sudo kill -9 `sudo lsof -t -i:{PORT_NUMBER}`sudo kill -9 $(sudo lsof -t -i:4000)