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halt



SYNOPSIS

       /sbin/halt [-n] [-w] [-d] [-f] [-i] [-p]
       /sbin/reboot [-n] [-w] [-d] [-f] [-i]
       /sbin/poweroff [-n] [-w] [-d] [-f] [-i]
       /sbin/swsusp [-w] [-d]


DESCRIPTION

       Halt  notes  that  the system is being brought down in the
       file /var/log/wtmp, and then either tells  the  kernel  to
       halt,  reboot,  poweroff or suspend the system. If halt or
       reboot is called when the system is not in runlevel  0  or
       6,  shutdown(8)  will be invoked instead (with the flag -h
       or -r).


OPTIONS

       -n     Don't sync before reboot or halt.

       -w     Don't actually reboot or halt but  only  write  the
              wtmp record (in the /var/log/wtmp file).

       -d     Don't  write  the  wtmp record. The -n flag implies
              -d.

       -f     Force halt or reboot, don't call shutdown(8).

       -i     Shut down all network interfaces just  before  halt
              or reboot.

       -p     When halting the system, do a poweroff. This is the
              default when halt is called as poweroff.


DIAGNOSTICS

       If you're not the superuser,  you  will  get  the  message
       `must be superuser'.


NOTES

       Under  older  sysvinit  releases  , reboot and halt should
       never be called directly. From release 2.74  on  halt  and
       reboot invoke shutdown(8) if the system is not in runlevel
       0 or 6. This means that if halt or reboot cannot find  out
       the  current  runlevel  (for  example,  when /var/run/utmp
       hasn't  been  initialized  correctly)  shutdown  will   be
       called, which might not be what you want.  Use the -f flag
       if you want to do a hard halt or reboot.


AUTHOR

       Miquel van Smoorenburg, miquels@cistron.nl


SEE ALSO

       shutdown(8), init(8)

  




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