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nologin(5) [netbsd man page]

NOLOGIN(5)						      BSD File Formats Manual							NOLOGIN(5)

nologin -- file disallowing and containing reason for disallowing logins DESCRIPTION
The file /etc/nologin, if it exists, causes the login procedure, used by programs such as login(1), to terminate. The program may display the contents of /etc/nologin to the user before exiting. This file is a simple mechanism to temporarily prevent incoming logins. As such, the file /etc/nologin is created by shutdown(8) five min- utes before system shutdown, or immediately if shutdown is in less than five minutes. The file /etc/nologin is removed just before shutdown(8) exits. To disable logins on a per-account basis, see nologin(8). The file /etc/nologin has no affect on the login procedure for the root user. FILES
/etc/nologin The nologin file resides in /etc. EXAMPLES
NO LOGINS: System going down at 18:22 SEE ALSO
login(1), ftpd(8), nologin(8), rshd(8), shutdown(8), sshd(8) BSD
December 9, 2005 BSD

Check Out this Related Man Page

SHUTDOWN(8)						      System Manager's Manual						       SHUTDOWN(8)

shutdown - close down the system at a given time SYNOPSIS
shutdown [ -k ] [ -r ] [ -h ] [ -f ] [ -n ] time [ warning-message ... ] DESCRIPTION
Shutdown provides an automated shutdown procedure which a super-user can use to notify users nicely when the system is shutting down, sav- ing them from system administrators, hackers, and gurus, who would otherwise not bother with niceties. Time is the time at which shutdown will bring the system down and may be the word now (indicating an immediate shutdown) or specify a future time in one of two formats: +number and hour:min. The first form brings the system down in number minutes and the second brings the system down at the time of day indicated (as a 24-hour clock). At intervals which get closer together as apocalypse approaches, warning messages are displayed at the terminals of all users on the sys- tem. Five minutes before shutdown, or immediately if shutdown is in less than 5 minutes, logins are disabled by creating /etc/nologin and writing a message there. If this file exists when a user attempts to log in, login(1) prints its contents and exits. The file is removed just before shutdown exits. At shutdown time a message is written in the system log, containing the time of shutdown, who ran shutdown and the reason. Then a termi- nate signal is sent to init to bring the system down to single-user state. Alternatively, if -r, -h, or -k was used, then shutdown will exec reboot(8), halt(8), or avoid shutting the system down (respectively). (If it isn't obvious, -k is to make people think the system is going down!) With the -f option, shutdown arranges, in the manner of fastboot(8), that when the system is rebooted the file systems will not be checked. The -n option prevents the normal sync(2) before stopping. The time of the shutdown and the warning message are placed in /etc/nologin and should be used to inform the users about when the system will be back up and why it is going down (or anything else). FILES
/etc/nologin tells login not to let anyone log in SEE ALSO
login(1), reboot(8), fastboot(8) BUGS
Only allows you to kill the system between now and 23:59 if you use the absolute time for shutdown. 4th Berkeley Distribution November 16, 1996 SHUTDOWN(8)
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