#!/bin/bash

##############
# Returns the name of the service
#  running on a given port.
##############

if [ ! "$UID" = 0 ]; then
	echo "Must be ran as root"
	exit 1
fi

if [ ! "$1" -gt 0 ] || [ ! "$1" -lt 65536 ]; then
	echo "Port number must be in range 1 - 65535"
        exit 2
fi
ss -tulpn | grep LISTEN | grep -E ":$1\b" | grep -Po "(?<=\(\(\").+?(?=\")" | uniq