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Length: 3261 (0xcbd)
Types: TextFile
Notes: UNIX file
Names: »shutdown.8«
└─⟦26887b7e0⟧ Bits:30009717 Comet 32 harddisk image
└─⟦28c352965⟧ »/a« UNIX Filesystem
└─⟦this⟧ »usr/man/cat8/shutdown.8«
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SHUTDOWN(8) UNIX Programmer's Manual SHUTDOWN(8)
NAME
shutdown - close down the system at a given time
SYNOPSIS
/etc/shutdown [ -k ] [ -r ] [ -h ] time [ warning-message
... ]
DESCRIPTION
_▶08◀S_▶08◀h_▶08◀u_▶08◀t_▶08◀d_▶08◀o_▶08◀w_▶08◀n provides an automated shutdown procedure which a
super-user can use to notify users nicely when the system
is shutting down, saving them from system administrators,
hackers, and gurus, who would otherwise not bother with
niceties.
_▶08◀T_▶08◀i_▶08◀m_▶08◀e is the time at which _▶08◀s_▶08◀h_▶08◀u_▶08◀t_▶08◀d_▶08◀o_▶08◀w_▶08◀n will bring the system
down and may take two formats: +number and hour:min. The
first form brings the system down in _▶08◀n_▶08◀u_▶08◀m_▶08◀b_▶08◀e_▶08◀r minutes and
the second brings the system down at the time of day indi-
cated (as a 24-hour clock).
At intervals which get closer together as apocalypse
approaches, warning messages are displayed at the termi-
nals of all users on the system. 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
logs in, _▶08◀l_▶08◀o_▶08◀g_▶08◀i_▶08◀n(1) prints its contents and exits. The file
is removed just before _▶08◀s_▶08◀h_▶08◀u_▶08◀t_▶08◀d_▶08◀o_▶08◀w_▶08◀n exits.
At shutdown time a message is written in the file
/usr/adm/shutdownlog, containing the time of shutdown, who
ran shutdown and the reason. Then a terminate signal is
sent at _▶08◀i_▶08◀n_▶08◀i_▶08◀t to bring the system down to single-user
state. Alternatively, if -r, -h, or -k was used, then
_▶08◀s_▶08◀h_▶08◀u_▶08◀t_▶08◀d_▶08◀o_▶08◀w_▶08◀n will exec _▶08◀r_▶08◀e_▶08◀b_▶08◀o_▶08◀o_▶08◀t(8), _▶08◀h_▶08◀a_▶08◀l_▶08◀t(8), or avoid shutting
the system down (respectively). (If it isn't obvious, -k
is to make people _▶08◀t_▶08◀h_▶08◀i_▶08◀n_▶08◀k the system is going down!)
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
/usr/adm/shutdownlog log file for succesful shutdowns.
SEE ALSO
login(1), reboot(8)
BUGS
Only allows you to kill the system between now and 23:59
if you use the absolute time for shutdown.
Times to shutdown are not nice and round, i.e. ``shutdown
in 18 seconds''.
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