how to stop services running on a particular port in ubuntu terminal code example

Example 1: 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 2: kill port 3000 ubuntu

fuser -n tcp -k 9001