shutdown(1m)
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shutdown
shut down system, change system state
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SYNTAX
/etc/shutdown [ -y ] [ -ggrace_period [ -iinit_state ]
DESCRIPTION
This command is executed by the superuser to change the state of
the machine. By default, it brings the system to a state where
only the operator console has access to the UNIX system. This
state is traditionally called "single-user".
The command sends a warning message to all of the terminals (all
the people currently logged in) and a final message before it
starts actual shutdown activities. By default, the command asks
the user at the console for confirmation before it starts
shutting down daemons and killing processes. The options are
used as follows:
-y pre-answers the confirmation question so the command can be
run without user intervention. A default of 60 seconds is
allowed between the warning message and the final message.
Another 60 seconds is allowed between the final message and
the confirmation.
-ggrace_period
allows the superuser to change the number of seconds from
the 60-second default. grace_period is expressed in
seconds: g300 gives a 5-minute warning.
-iinit_state
specifies the state that init(1M) is to be put in following
the warnings, if any. By default, system state "s" is used.
Possible system states are:
state s, S
Bring the machine to the state traditionally called single-
user. The /etc/rcS.d rc scripts are called to do this work.
All processes are killed and all file systems other than
root are unmounted.
state 1
Bring the machine to the state called the administrator run
level. Both /root and /usr will be mounted, and the update
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shutdown(1m)
demon will be running. If specified in the /etc/inittab/
file, optional "administrative" terminals will have gettys
spawned.
SEE ALSO
init(1m).
inittab(4) in the Programmer's Reference for the DG/UX System.
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