xref: /freebsd/sbin/reboot/reboot.8 (revision 1e413cf93298b5b97441a21d9a50fdcd0ee9945e)
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28.\"	@(#)reboot.8	8.1 (Berkeley) 6/9/93
29.\" $FreeBSD$
30.\"
31.Dd June 9, 1993
32.Dt REBOOT 8
33.Os
34.Sh NAME
35.Nm reboot ,
36.Nm halt ,
37.Nm fastboot ,
38.Nm fasthalt
39.Nd stopping and restarting the system
40.Sh SYNOPSIS
41.Nm halt
42.Op Fl lnpq
43.Op Fl k Ar kernel
44.Nm
45.Op Fl dlnpq
46.Op Fl k Ar kernel
47.Nm fasthalt
48.Op Fl lnpq
49.Op Fl k Ar kernel
50.Nm fastboot
51.Op Fl dlnpq
52.Op Fl k Ar kernel
53.Sh DESCRIPTION
54The
55.Nm halt
56and
57.Nm
58utilities flush the file system cache to disk, send all running processes
59a
60.Dv SIGTERM
61(and subsequently a
62.Dv SIGKILL )
63and, respectively, halt or restart the system.
64The action is logged, including entering a shutdown record into the
65.Xr wtmp 5
66file.
67.Pp
68The options are as follows:
69.Bl -tag -width indent
70.It Fl d
71The system is requested to create a crash dump.
72This option is
73supported only when rebooting, and it has no effect unless a dump
74device has previously been specified with
75.Xr dumpon 8 .
76.It Fl k Ar kernel
77Boot the specified
78.Ar kernel
79on the next system boot.
80If the kernel boots successfully, the
81.Em default
82kernel will be booted on successive boots, this is a one-shot option.
83If the boot fails, the system will continue attempting to boot
84.Ar kernel
85until the boot process is interrupted and a valid kernel booted.
86This may change in the future.
87.It Fl l
88The halt or reboot is
89.Em not
90logged to the system log.
91This option is intended for applications such as
92.Xr shutdown 8 ,
93that call
94.Nm
95or
96.Nm halt
97and log this themselves.
98.It Fl n
99The file system cache is not flushed.
100This option should probably not be used.
101.It Fl p
102The system will turn off the power if it can.
103If the power down action fails, the system
104will halt or reboot normally, depending on whether
105.Nm halt
106or
107.Nm
108was called.
109.It Fl q
110The system is halted or restarted quickly and ungracefully, and only
111the flushing of the file system cache is performed (if the
112.Fl n
113option is not specified).
114This option should probably not be used.
115.El
116.Pp
117The
118.Nm fasthalt
119and
120.Nm fastboot
121utilities are nothing more than aliases for the
122.Nm halt
123and
124.Nm
125utilities.
126.Pp
127Normally, the
128.Xr shutdown 8
129utility is used when the system needs to be halted or restarted, giving
130users advance warning of their impending doom and cleanly terminating
131specific programs.
132.Sh SEE ALSO
133.Xr wtmp 5 ,
134.Xr boot 8 ,
135.Xr dumpon 8 ,
136.Xr nextboot 8 ,
137.Xr savecore 8 ,
138.Xr shutdown 8 ,
139.Xr sync 8
140.Sh HISTORY
141A
142.Nm
143utility appeared in
144.At v6 .
145