NAME
shutdown - graciously close the system down
SYNOPSIS
shutdown [-hrRmk] [-x code] [time-specification [message]]
DESCRIPTION
Shutdown is a program which allows a system operator to
close down the system in an nice way. Shutdown informs the
users why and when the system is going down. This warning
is issued 10 minutes before shutdown time and every minute
in the last 5 minutes. At this time (5 minutes), shutdown
creates a file /etc/nologin to prevent new users from log-
ging in.
Shutdown keeps a logfile of shutdowns. Every shutdown is
registered in /usr/adm/wtmp, if this file exists, and by
syslog(3) (level auth.notice). After these actions, a call
is done to reboot(2) which actually brings the system down.
Time-specification may be something like 15:00, 15.00, +15,
or now for a shutdown at 3pm (twice), 15 minutes from now,
or immediately.
The message may be used to describe why the system is going
down, it may also be typed on standard input with the -m
option.
OPTIONS
-h This flag prevents the system from rebooting after the
shutdown. The system can now be powered off. This is
the default.
-r This flag indicates that the system should reboot after
shutting down.
-R Reboot the system by resetting it. Normally the kernel
will try to return to the Boot Monitor. With -R the
system will receive a hardware reset.
-x code
Halt the system and let the Monitor execute the given
code as if typed at the monitor prompt. You can for
instance use -x 'boot hd0' as a very fast way to reboot
"from the top."
-m Allows the operator to type a shutdown message on stan-
dard input, that will be added to the messages
displayed on all terminals.
-k This option gives the possibility of terminating an
already started shutdown. This is only possible if
shutdown time has not yet arrived.
-C Check if the system crashed. This option is not used
at shutdown time, but at reboot time. It tells if the
file systems should be checked by testing if the last
entry in the wtmp file is a shutdown entry. (A crude
replacement for a file system clean flag.)
SEE ALSO
reboot(2), syslog(3), halt(8), boot(8).
AUTHOR
Edvard Tuinder (v892231@si.hhs.NL)