#!/bin/sh

usage() {
  cat >&2 << EOF
killport: kill -9 any process that is bound to a local port
Usage:
  killport <port>
EOF
}

case "$1" in
  "-h") usage && exit 0 ;;
  "--help") usage && exit 0 ;;
esac


PORT=$1
[ -z "$PORT" ] && echo "killport: Please provide a <port>!" && usage && exit 1 >&2
[ "$PORT" -lt 1 ] && echo "killport: port must be a postive integer!" && usage && exit 1 >&2

PID=$(lsof -i tcp:$PORT | tail -n1 | awk '{print $2}')
NAME=$(lsof -i tcp:$PORT | tail -n1 | awk '{print $1}')
[ -z "$PID" ] && echo "No process bound to $PORT, doing nothing" && exit 0 >&2

echo "Killing process $NAME (PID: $PID) that is bound to local port $PORT"
kill -9 $PID