About: https://banochkin.com/blog/rkn-check/
Clone this repository:
git clone https://github.com/Banochkin/rkn-checker
Edit settings.conf by putting your Telegram bot token on the first line and your (or your desired) user id on the second.
./rkn-checker.sh
The sites.txt file in the script directory is checked by default. You can specify a third-party txt file, for example:
./rkn-checker.sh file.txt