Kill by port

killp.sh

#! /bin/bash

PORT=$1

if [[ -z "$PORT" ]]; then
  echo "Usage: killp <port>"
  exit 1
fi

PID=`lsof -i :$PORT -t`
if [[ -n "$PID" ]]; then
  echo "Killing process listening on $PORT"
  kill -9 $PID
else
  echo "No process listeing on $PORT"
fi