Kill a process using a port

kill_pid_on_port.sh

function kill_process_using_port() {
  echo "attempting to kill process on port $1"
  PID=$(lsof -t -i ":${1}")
  if [ -z "${PID}" ]; then
    echo "no process found using port ${1}"
    return 1
  fi
  echo "killing pid ${PID}"
  kill -9 "${PID}"
  return 0
}