SHUTDOWN(8) Maintenance Commands and Procedures SHUTDOWN(8)

NAME

shutdown - shut down system, change system state

SYNOPSIS

/usr/sbin/shutdown [-y] [-g grace-period] [-i init-state]
[message]

DESCRIPTION

shutdown is executed by the super user to change the state of the
machine. In most cases, it is used to change from the multi-user state
(state 2) to another state.


By default, shutdown brings the system to a state where only the console
has access to the operating system. This state is called single-user.


Before starting to shut down daemons and killing processes, shutdown
sends a warning message and, by default, a final message asking for
confirmation. message is a string that is sent out following the standard
warning message "The system will be shut down in ..." If the string
contains more than one word, it should be contained within single (') or
double (") quotation marks.


The warning message and the user provided message are output when there
are 7200, 3600, 1800, 1200, 600, 300, 120, 60, and 30 seconds remaining
before shutdown begins. See EXAMPLES.


System state definitions are:

state 0
Stop the operating system.


state 1
State 1 is referred to as the administrative state. In
state 1 file systems required for multi-user operations are
mounted, and logins requiring access to multi-user file
systems can be used. When the system comes up from firmware
mode into state 1, only the console is active and other
multi-user (state 2) services are unavailable. Note that
not all user processes are stopped when transitioning from
multi-user state to state 1.


state s, S
State s (or S) is referred to as the single-user state. All
user processes are stopped on transitions to this state. In
the single-user state, file systems required for multi-user
logins are unmounted and the system can only be accessed
through the console. Logins requiring access to multi-user
file systems cannot be used.


state 5
Shut the machine down so that it is safe to remove the
power. Have the machine remove power, if possible. The rc0
procedure is called to perform this task.


state 6
Stop the operating system and reboot to the state defined
by the initdefault entry in /etc/inittab. The rc6 procedure
is called to perform this task.

OPTIONS

-y
Pre-answer the confirmation question so the command
can be run without user intervention.


-g grace-period
Allow the super user to change the number of seconds
from the 60-second default.


-i init-state
If there are warnings, init-state specifies the state
init is to be in. By default, system state `s' is
used.

EXAMPLES

Example 1: Using shutdown

In the following example, shutdown is being executed on host foo and is
scheduled in 120 seconds. The warning message is output 2 minutes, 1
minute, and 30 seconds before the final confirmation message.


example# shutdown -i S -g 120 "===== disk replacement ====="
Shutdown started. Tue Jun 7 14:51:40 PDT 1994

Broadcast Message from root (pts/1) on foo Tue Jun 7 14:51:41...
The system will be shut down in 2 minutes
===== disk replacement =====
Broadcast Message from root (pts/1) on foo Tue Jun 7 14:52:41...
The system will be shut down in 1 minutes
===== disk replacement =====
Broadcast Message from root (pts/1) on foo Tue Jun 7 14:53:41...
The system will be shut down in 30 seconds
===== disk replacement =====
Do you want to continue? (y or n):

FILES

/etc/inittab
controls process dispatching by init

SEE ALSO

init.d(5), inittab(5), nologin(5), attributes(7), boot(8), halt(8),
init(8), killall(8), reboot(8), ufsdump(8)

NOTES

When a system transitions down to the S or s state, the /etc/nologin file
(see nologin(5)) is created. Upon subsequent transition to state 2
(multi-user state), this file is removed by a script in the /etc/rc2.d
directory.

May 9, 2001 SHUTDOWN(8)