You need to create an user with Access from the internet allowed in your FritzBox panel, after that:
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Download the script and edit line 2 and 3 with your username and your password
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Make the script executable
chmod +x /path/to/fritzBoxShell.sh -
Add this to your .bashrc
alias fritzbox="/path/to/fritzBoxShell.sh" -
Restart your shell and then you can use FritzBoxShell
fritzbox help