| [9] | 1 | .TH SHUTDOWN 8
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| 2 | .SH NAME
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| 3 | shutdown \- graciously close the system down
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| 4 | .SH SYNOPSIS
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| 5 | .B shutdown
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| 6 | .RB [ \-hrRmk ]
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| 7 | .RB [ \-x
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| 8 | .IR code ]
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| 9 | .RI [ time-specification
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| 10 | .RI [ message ]]
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| 11 | .SH DESCRIPTION
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| 12 | .B Shutdown
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| 13 | is a program which allows a system operator to close down the system
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| 14 | in an nice way.
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| 15 | .B Shutdown
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| 16 | informs the users why and when the system is going down. This warning
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| 17 | is issued 10 minutes before shutdown time and every minute in the last
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| 18 | 5 minutes. At this time (5 minutes),
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| 19 | .B shutdown
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| 20 | creates a file
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| 21 | .B /etc/nologin
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| 22 | to prevent new users from logging in.
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| 23 | .PP
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| 24 | .B Shutdown
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| 25 | keeps a logfile of shutdowns. Every shutdown is registered in
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| 26 | .BR /usr/adm/wtmp ,
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| 27 | if this file exists, and by
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| 28 | .BR syslog (3)
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| 29 | (level
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| 30 | .BR auth . notice ).
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| 31 | After these actions, a call is done to
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| 32 | .BR reboot (2)
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| 33 | which actually brings the system down.
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| 34 | .PP
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| 35 | .I Time-specification
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| 36 | may be something like
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| 37 | .BR 15:00 ,
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| 38 | .BR 15.00 ,
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| 39 | .BR +15 ,
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| 40 | or
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| 41 | .B now
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| 42 | for a shutdown at 3pm (twice), 15 minutes from now, or immediately.
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| 43 | .PP
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| 44 | The message may be used to describe why the system is going down, it may
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| 45 | also be typed on standard input with the
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| 46 | .B \-m
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| 47 | option.
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| 48 | .SH OPTIONS
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| 49 | .TP
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| 50 | .B \-h
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| 51 | This flag prevents the system from rebooting after the shutdown. The
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| 52 | system can now be powered off. This is the default.
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| 53 | .TP
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| 54 | .B \-r
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| 55 | This flag indicates that the system should reboot after shutting down.
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| 56 | .TP
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| 57 | .B \-R
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| 58 | Reboot the system by resetting it. Normally the kernel will try to return
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| 59 | to the Boot Monitor. With
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| 60 | .B \-R
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| 61 | the system will receive a hardware reset.
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| 62 | .TP
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| 63 | .BI \-x " code"
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| 64 | Halt the system and let the Monitor execute the given code as if typed at
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| 65 | the monitor prompt. You can for instance use
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| 66 | .B "\-x 'boot hd0'"
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| 67 | as a very fast way to reboot "from the top."
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| 68 | .TP
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| 69 | .B \-m
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| 70 | Allows the operator to type a shutdown message on standard input, that will
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| 71 | be added to the messages displayed on all terminals.
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| 72 | .TP
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| 73 | .B \-k
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| 74 | This option gives the possibility of terminating an already started
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| 75 | shutdown. This is only possible if shutdown time has not yet arrived.
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| 76 | .TP
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| 77 | .B \-C
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| 78 | Check if the system crashed. This option is not used at shutdown time,
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| 79 | but at reboot time. It tells if the file systems should be checked by
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| 80 | testing if the last entry in the wtmp file is a shutdown entry. (A
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| 81 | crude replacement for a file system clean flag.)
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| 82 | .SH "SEE ALSO"
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| 83 | .BR reboot (2),
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| 84 | .BR syslog (3),
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| 85 | .BR halt (8),
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| 86 | .BR boot (8).
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| 87 | .SH AUTHOR
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| 88 | Edvard Tuinder (v892231@si.hhs.NL)
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