quack

Bash script for Duck DNS

Features

• 🎯 Extremely lightweight for your server: lowest impact on CPU, RAM and Network
• 📉 Extremely lightweight for duckdns.org: connect to it only when your IP changes
• 🤓 Nerd friendly: /tmp/last_ip stores IP in plaintext
• 🔒 Privacy friendly: check the "online status" with Open DNS
• 👍 Simple IP detection with icanhazip.com
• 💪 Robust: I don't think this script needs compatibility updates (except for IPV6, then curl -6 is the only thing to edit)

Setup

1. 📦 Install Dependencies

• wget
• curl
• cron (optional)

2. 📜 Install the script

Download the script directly from GitHub

sudo su
cd /usr/bin
wget https://raw.githubusercontent.com/TonyWhite/quack/main/quack
chmod +x quack

3. 📅 Launch with Cron (optional)

Edit cron with root

sudo su
crontab -e

Append this and save

* * * * * quack >/dev/null 2>&1

IP will be checked every minute.

💣 Uninstall

You are free to brutally delete this script from your machine.

rm /usr/bin/quack /tmp/last_ip

Now remove unused packages:

• wget (usually installed by default)
• curl
• cron (usually installed by default)