#!/bin/sh

error () {
  printf "%s\n" "$@"
  exit 1
}

[ -z "$1" ] && error "Please provide a port to check!"

PID="$(sudo fuser "$1/tcp" 2>&1 | awk '{print $2}')"
[ -n "$PID" ] || error "No program using port $1!"

BINPATH="$(\ps "$PID" | awk '{print $5}')"
basename "$BINPATH"