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1 perry 1 HALT
2 !!!HALT
3 NAME
4 SYNOPSIS
5 DESCRIPTION
6 OPTIONS
7 DIAGNOSTICS
8 NOTES
9 AUTHOR
10 SEE ALSO
11 ----
12 !!NAME
13
14
15 halt, reboot, poweroff - stop the system.
16 !!SYNOPSIS
17
18
19 __/sbin/halt__ [[__-n__] [[__-w__] [[__-d__]
20 [[__-f__] [[__-i__] [[__-p__] [[__-h__]__
21 /sbin/reboot__ [[__-n__] [[__-w__] [[__-d__]
22 [[__-f__] [[__-i__]__
23 /sbin/poweroff__ [[__-n__] [[__-w__] [[__-d__]
24 [[__-f__] [[__-i__] [[__-h__]
25 !!DESCRIPTION
26
27
28 __Halt__ notes that the system is being brought down in
29 the file ''/var/log/wtmp'', and then either tells the
30 kernel to halt, reboot or poweroff the system.
31
32
33 If __halt__ or __reboot__ is called when the system is
34 ''not'' in runlevel __0__ or __6__, in other words
35 when it's running normally, __shutdown__ will be invoked
36 instead (with the __-h__ or __-r__ flag). For more
37 info see the shutdown(8) manpage.
38
39
40 The rest of this manpage describes the behaviour in
41 runlevels 0 and 6, that is when the systems shutdown scripts
42 are being run.
43 !!OPTIONS
44
45
46 __-n__
47
48
49 Don't sync before reboot or halt.
50
51
52 __-w__
53
54
55 Don't actually reboot or halt but only write the wtmp record
56 (in the ''/var/log/wtmp'' file).
57
58
59 __-d__
60
61
62 Don't write the wtmp record. The __-n__ flag implies
63 __-d__.
64
65
66 __-f__
67
68
69 Force halt or reboot, don't call
70 shutdown(8).
71
72
73 __-i__
74
75
76 Shut down all network interfaces just before halt or
77 reboot.
78
79
80 __-h__
81
82
83 Put all harddrives on the system in standby mode just before
84 halt or poweroff.
85
86
87 __-p__
88
89
90 When halting the system, do a poweroff. This is the default
91 when halt is called as __poweroff__.
92 !!DIAGNOSTICS
93
94
95 If you're not the superuser, you will get the message `must
96 be superuser'.
97 !!NOTES
98
99
100 Under older __sysvinit__ releases , __reboot__ and
101 __halt__ should never be called directly. From release
102 2.74 on __halt__ and __reboot__ invoke
103 shutdown(8) if the system is not in runlevel 0 or 6.
104 This means that if __halt__ or __reboot__ cannot find
105 out the current runlevel (for example, when
106 ''/var/run/utmp'' hasn't been initialized correctly)
107 __shutdown__ will be called, which might not be what you
108 want. Use the __-f__ flag if you want to do a hard
109 __halt__ or __reboot__.
110
111
112 The __-h__ flag puts all harddisks in standby mode just
113 before halt or poweroff. Right now this is only implemented
114 for IDE drives. A side effect of putting the drive in
115 standby mode is that the write cache on the disk is flushed.
116 This is important for IDE drives, since the kernel doesn't
117 flush the write-cache itself before poweroff.
118
119
120 The __halt__ program uses /proc/ide/hd* to find all IDE
121 disk devices, which means that /proc needs to be mounted
122 when __halt__ or __poweroff__ is called or the
123 __-h__ switch will do nothing.
124 !!AUTHOR
125
126
127 Miquel van Smoorenburg, miquels@cistron.nl
128 !!SEE ALSO
129
130
131 shutdown(8), init(8)
132 ----
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