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shutdown (8)
  • shutdown (1) ( Solaris man: Команды и прикладные программы пользовательского уровня )
  • shutdown (1) ( Русские man: Команды и прикладные программы пользовательского уровня )
  • shutdown (2) ( FreeBSD man: Системные вызовы )
  • shutdown (2) ( Русские man: Системные вызовы )
  • shutdown (2) ( Linux man: Системные вызовы )
  • shutdown (3) ( Solaris man: Библиотечные вызовы )
  • shutdown (3) ( POSIX man: Библиотечные вызовы )
  • >> shutdown (8) ( FreeBSD man: Команды системного администрирования )
  • shutdown (8) ( Linux man: Команды системного администрирования )

  • BSD mandoc
     

    NAME

    
    
    shutdown
    
     - close down the system at a given time
    
     
    

    SYNOPSIS

    [- ] [-h | -p -r | -k ] [-o [-n ] ] time [warning-message ... ]  

    DESCRIPTION

    The utility provides an automated shutdown procedure for super-users to nicely notify users when the system is shutting down, saving them from system administrators, hackers, and gurus, who would otherwise not bother with such niceties.

    The following options are available:

    -h
    The system is halted at the specified time
    -p
    The system is halted and the power is turned off (hardware support required) at the specified time
    -r
    The system is rebooted at the specified time
    -k
    Kick everybody off. The -k option does not actually halt the system, but leaves the system multi-user with logins disabled (for all but super-user).
    -o
    If one of the -h -p or -r is specified, will execute halt(8) or reboot(8) instead of sending signal to init(8).
    -n
    If the -o is specified, prevent the file system cache from being flushed by passing -n option to halt(8) or reboot(8). This option should probably not be used.
    time
    Time is the time at which 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 or yymmddhhmm where the year, month, and day may be defaulted to the current system values. The first form brings the system down in number minutes and the second at the absolute time specified.
    warning-message
    Any other arguments comprise the warning message that is broadcast to users currently logged into the system.
    -
    If `- ' is supplied as an option, the warning message is read from the standard input.

    At intervals, becoming more frequent as apocalypse approaches and starting at ten hours before shutdown, warning messages are displayed on the terminals of all users logged in. Five minutes before shutdown, or immediately if shutdown is in less than 5 minutes, logins are disabled by creating /var/run/nologin and copying the warning 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 exits.

    At shutdown time a message is written to the system log, containing the time of shutdown, the person who initiated the shutdown and the reason. Corresponding signal is then sent to init(8) to respectively halt, reboot or bring the system down to single-user state (depending on the above options). The time of the shutdown and the warning message are placed in /var/run/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).

    A scheduled shutdown can be canceled by killing the process (a SIGTERM should suffice). The /var/run/nologin file that created will be removed automatically.  

    FILES

    /var/run/nologin
    tells login not to let anyone log in

     

    COMPATIBILITY

    The hours and minutes in the second time format may be separated by a colon (``:'') for backward compatibility.  

    SEE ALSO

    kill(1), login(1), wall(1), nologin(5), halt(8), init(8), reboot(8)  

    HISTORY

    The utility appeared in BSD 4.0


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    FILES
    COMPATIBILITY
    SEE ALSO
    HISTORY


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