Provided by: manpages_6.9.1-1_all 

NAME
nologin - prevent unprivileged users from logging into the system
DESCRIPTION
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.
FILES
/etc/nologin
SEE ALSO
login(1), shutdown(8)
Linux man-pages 6.9.1 2024-05-02 nologin(5)