reboot.tproj/reboot.8

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  32 .\"     @(#)reboot.8    8.1 (Berkeley) 6/9/93
  33 .\" $FreeBSD: src/sbin/reboot/reboot.8,v 1.21 2002/12/27 12:15:33 schweikh Exp $
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  35 .Dd June 9, 1993
  36 .Dt REBOOT 8
  37 .Os
  38 .Sh NAME
  39 .Nm reboot ,
  40 .Nm halt
  41 .Nd stopping and restarting the system
  42 .Sh SYNOPSIS
  43 .Nm halt
  44 .Op Fl lnqu
  45 .Nm
  46 .Op Fl lnq
  47 .Sh DESCRIPTION
  48 The
  49 .Nm halt
  50 and
  51 .Nm
  52 utilities flush the file system cache to disk, send all running processes
  53 a
  54 .Dv SIGTERM
  55 (and subsequently a
  56 .Dv SIGKILL )
  57 and, respectively, halt or restart the system.
  58 The action is logged, including entering a shutdown record into the
  59 .Xr wtmp 5
  60 file.
  61 .Pp
  62 When the system is halted with the halt command, the system is powered off.
  63 .Pp
  64 The options are as follows:
  65 .Bl -tag -width indent
  66 .It Fl l
  67 The halt or reboot is
  68 .Em not
  69 logged to the system log.
  70 This option is intended for applications such as
  71 .Xr shutdown 8 ,
  72 that call
  73 .Nm
  74 or
  75 .Nm halt
  76 and log this themselves.
  77 .It Fl n
  78 The file system cache is not flushed.
  79 This option should probably not be used.
  80 .It Fl q
  81 The system is halted or restarted quickly and ungracefully, and only
  82 the flushing of the file system cache is performed (if the
  83 .Fl n
  84 option is not specified).
  85 This option should probably not be used.
  86 .It Fl u
  87 The system is halted up until the point of removing system power, but waits
  88 before removing power for 5 minutes so that an external UPS
  89 (uninterruptible power supply) can forcibly remove power.
  90 This simulates a dirty shutdown to permit a later automatic power on. OS X uses
  91 this mode automatically with supported UPSs in emergency shutdowns.
  92 .El
  93 .Pp
  94 Normally, the
  95 .Xr shutdown 8
  96 utility is used when the system needs to be halted or restarted, giving
  97 users advance warning of their impending doom and cleanly terminating
  98 specific programs.
  99 .Sh SEE ALSO
 100 .Xr wtmp 5 ,
 101 .Xr shutdown 8 ,
 102 .Xr sync 8
 103 .Sh HISTORY
 104 A
 105 .Nm
 106 utility appeared in
 107 .At v6 .