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1.1 root 1: .\" Copyright (c) 1980 Regents of the University of California.
2: .\" All rights reserved. The Berkeley software License Agreement
3: .\" specifies the terms and conditions for redistribution.
4: .\"
5: .\" @(#)shutdown.8 6.4 (Berkeley) 5/26/86
6: .\"
7: .TH SHUTDOWN 8 "May 26, 1986"
8: .UC 4
9: .SH NAME
10: shutdown \- close down the system at a given time
11: .SH SYNOPSIS
12: .B /etc/shutdown
13: [
14: .B \-k
15: ] [
16: .B \-r
17: ] [
18: .B \-h
19: ] [
20: .B \-f
21: ] [
22: .B \-n
23: ]
24: time [ warning-message ... ]
25: .SH DESCRIPTION
26: .I Shutdown
27: provides an automated shutdown procedure which a super-user
28: can use to notify users
29: nicely when the system is shutting down, saving them from
30: system administrators, hackers, and gurus, who would otherwise
31: not bother with niceties.
32: .LP
33: .I Time
34: is the time at which
35: .I shutdown
36: will bring the system down and
37: may be the word
38: .B now
39: (indicating an immediate shutdown)
40: or specify a future time in one of two formats:
41: .BR + number
42: and
43: .RB hour : min.
44: The first form brings the system down in
45: .I number
46: minutes
47: and the second brings the system down at the time of day indicated
48: (as a 24\-hour clock).
49: .PP
50: At intervals which get closer together as apocalypse approaches,
51: warning messages are displayed at the terminals of all users on the
52: system. Five minutes before shutdown, or immediately if
53: shutdown is in less than 5 minutes, logins are disabled by
54: creating
55: /etc/nologin
56: and writing a message there.
57: If this file exists when a user attempts to log in,
58: .IR login (1)
59: prints its contents
60: and exits.
61: The file is removed just before
62: .I shutdown
63: exits.
64: .PP
65: At shutdown time a
66: message is written in the system log, containing the
67: time of shutdown, who ran shutdown and the reason.
68: Then a terminate signal is sent to
69: .I init
70: to bring the system down to single-user state.
71: Alternatively, if
72: .B \-r,
73: .B \-h,
74: or
75: .B \-k
76: was used, then
77: .I shutdown
78: will exec
79: .IR reboot (8),
80: .IR halt (8),
81: or avoid shutting the system down (respectively).
82: (If it isn't obvious,
83: .B \-k
84: is to make people
85: .I think
86: the system is going down!)
87: .PP
88: With the
89: .B \-f
90: option,
91: .I shutdown
92: arranges, in the manner of
93: .IR fastboot (8),
94: that when the system is rebooted the file systems will not
95: be checked. The
96: .B \-n
97: option prevents the normal
98: .IR sync (2)
99: before stopping.
100: .PP
101: The time of the shutdown and the warning message
102: are placed in /etc/nologin and should be used to
103: inform the users about when the system will be back up
104: and why it is going down (or anything else).
105: .SH FILES
106: .DT
107: /etc/nologin tells login not to let anyone log in
108: .SH "SEE ALSO"
109: login(1), reboot(8), fastboot(8)
110: .SH BUGS
111: Only allows you to kill the system between now and 23:59 if
112: you use the absolute time for shutdown.
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