kill localhost 3000 ubuntu

C++
sudo kill -9 `sudo lsof -t -i:3002`sudo kill -9 `sudo lsof -t -i:{PORT_NUMBER}`sudo kill -9 $(sudo lsof -t -i:9001)
sudo kill -9 $(sudo lsof -t -i:3000)
sudo kill -9 `sudo lsof -t -i:9001`

Source

Also in C++: