# nologin # Alternative shell that prevents a user from logging in. # More information: <https://manned.org/nologin.5>. # Set a user's login shell to `nologin` to prevent the user from logging in: chsh -s user nologin # Customize message for users with the login shell of `nologin`: echo "declined_login_message" > /etc/nologin.txt $Follow @igor_chubin cheat.sh tldr