shutdown - auf UNIX Systemen

Beispiele

Sleep

Sleep in 20 Minuten

sudo shutdown -s +20


man-Page

SHUTDOWN(8)               BSD System Manager's Manual              SHUTDOWN(8)

NAME
     shutdown -- close down the system at a given time

SYNOPSIS
     shutdown [-] [-h [-u] | -r | -s | -k] [-o [-n]] time
              [warning-message ...]

DESCRIPTION
     The shutdown 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.

     -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).

     -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.

     -o      If -h or -r is specified, shutdown will execute halt(8) or
             reboot(8) instead of sending a signal to launchd(8).

     -r      The system is rebooted at the specified time.

     -s      The system is put to sleep at the specified time.

     -u      The system is halted up until the point of removing system
             power, but waits before removing power for 5 minutes so that
             an external UPS (uninterruptible power supply) can forcibly
             remove power.  This simulates a dirty shutdown to permit a
             later automatic power on. OS X uses this mode automatically
             with supported UPSs in emergency shutdowns.

     time    Time is the time at which shutdown will bring the system
             down and may be the word now (indicating an immediate shut-
             down) 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 dis-
     played on the terminals of all users logged in.

     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 launchd(8) to respec-
     tively halt, reboot or bring the system down to single-user state
     (depending on the above options).

     A scheduled shutdown can be canceled by killing the shutdown process
     (a SIGTERM should suffice).

SIGTERM TO SIGKILL INTERVAL
     Upon shutdown, all running processes are sent a SIGTERM followed by
     a SIGKILL.  The SIGKILL will follow the SIGTERM by an intentionally
     indeterminate period of time.  Programs are expected to take only
     enough time to flush all dirty data and exit.  Developers are
     encouraged to file a bug with the OS vendor, should they encounter
     an issue with this functionality.

SEE ALSO
     kill(1), login(1), wall(1), halt(8), launchd(8), reboot(8)

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

HISTORY
     The shutdown utility appeared in 4.0BSD.

BSD                            December 11, 1998                           BSD

linux/shutdown.txt · Zuletzt geändert: 2015/07/06 22:32 (Externe Bearbeitung)