SHUTDOWN(8)             COMMAND REFERENCE             SHUTDOWN(8)



NAME
     shutdown - close down the system at a given time

SYNOPSIS
     shutdown [ -h ] [ -k ] [ -r ] time [ warning-message ... ]

DESCRIPTION
     The shutdown command evokes an automated shutdown procedure
     which also notifies the users when the system is shutting
     down; a superuser must invoke the shutdown command.  The
     command is normally run only in multi-user mode and it is
     the preferred method of shutting down the system when a
     "soft" power switch is not available.

     On machines without a "soft" power switch UTek must be
     prepared for turning off power so that information in disk
     buffers is not lost.  When more than one user is on a
     machine, the shutdown command allows notification to other
     users and their processes that the system is going to power
     down.  Users and some processes are then able to save
     important data before power is shut off.

     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 shorter as shutdown time approaches,
     warning-messages are displayed at the terminals 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 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 file
     /usr/adm/shutdownlog, containing the time of shutdown, who
     ran shutdown and the reason.  Then a terminate signal is
     sent to init to bring the system down to single-user state.

     The time of the shutdown and the warning message are placed
     in /etc/nologin and can be used to inform all users about
     when the system will be back up and why it is going down (or
     anything else).

OPTIONS
     Without any option shutdown moves the system from multi-user
     mode to single-user mode.




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SHUTDOWN(8)             COMMAND REFERENCE             SHUTDOWN(8)



     -h Performs its work and stops system operation as described
        for halt(8).

     -k Will not shut down the system (-k is to make users think
        the system is going down).

     -r Performs its work and reboots UTek as described for
        reboot(8).

EXAMPLES
     To shut down the workstation (gracefully) at a given time
     use the command:

          shutdown -h 20:15

     Where 20:15 represents the specified time you want the
     system to shut down.

     To shut down the workstation immediately use the command:

          shutdown -h now

     To shut down the workstation in a specified amount of
     minutes use the command:

          shutdown -h +10

     Where 10 is the specified system shut down time in minutes
     (shut the system down 10 minutes from now).

FILES
     /etc/nologin     tells login not to let anyone log in

     /usr/adm/shutdownlog
                      log file for successful shutdowns

     /fastboot        created during shutdown procedure after
                      successful disk check

RETURN VALUE
     [NO_ERRS]      Command completed without error.

     [USAGE]        Incorrect command line syntax. Execution
                    terminated.

     [NP_WARN]      An error warranting a warning message
                    occurred. Execution continues.

     [P_ERR]        A system error occurred. Execution
                    terminated.  See intro(2) for more
                    information on system errors.




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SHUTDOWN(8)             COMMAND REFERENCE             SHUTDOWN(8)



CAVEATS
     The shutdown command only allows you to kill the system
     between now and 23:59 if you use the absolute time for
     shutdown.

SEE ALSO
     login(1), fsck(8), and reboot(8).
















































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