Manpages - nologin.5

nologin - prevent unprivileged users from logging into the system

If the file /etc/nologin exists and is readable, *login*(1) will allow access only to root. Other users will be shown the contents of this file and their logins will be refused. This provides a simple way of temporarily disabling all unprivileged logins.

/etc/nologin

*login*(1), *shutdown*(8)

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