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|--shell]}} {{user}} nologin

• Customize message for users with the login shell of nologin:

echo "{{declined_login_message}}" > /etc/nologin.txt