port-check.sh - small script to check if TCP ports are opened through firewalls etc.

port-check.sh

#!/bin/bash

function checkport {
	if nc -zv -w30 $1 $2 <<< '' &> /dev/null
	then
		echo "[+] Port $1/$2 is open"
	else
		echo "[-] Port $1/$2 is closed"
	fi
}

# Example checks
checkport 'ad.server.one' 389
checkport 'ad.server.one' 636
checkport 'webserver.server.two' 443