#!/bin/sh
set -e

# This script is meant for quick & easy port finding tool for docker containers:
#   $ curl -fsSL gist.github.com/4669842/4745de80e90839eec44eb7ed3577c8af/raw/1ff0bf239022e6ce68006441c480b3653735a781/pscan.sh -o pscan.sh | bash pscan.sh
#
# NOTE: This is designed to be bundled within a package of scripts, while it does work on its
#       own, its currently very limited, I will plan on adding functionality.
	findaport=""
findaport= comm -23 <(seq 49152 65535) <(ss -tan | awk '{print $4}' | cut -d':' -f2 | grep "[0-9]\{1,5\}" | sort | uniq) | shuf | head -n 1
	echo "${findaport}"