#!/bin/bash

# print the first available bittorrent port for aria2

ports=$(
    netstat -4tlpn 2>&1 | tail -n+5 | awk '{print $4}' | cut -d: -f2 | sort -n)

topPort=22000

for port in {22000..22022}; do
    if echo "$ports" | grep "$port" -; then
        continue
    fi

    topPort=$port
    break
done

echo $topPort