89 lines
2.3 KiB
Groff
89 lines
2.3 KiB
Groff
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.TH SHUTDOWN 8
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.SH NAME
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shutdown \- graciously close the system down
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.SH SYNOPSIS
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.B shutdown
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.RB [ \-hrRmk ]
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.RB [ \-x
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.IR code ]
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.RI [ time-specification
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.RI [ message ]]
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.SH DESCRIPTION
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.B Shutdown
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is a program which allows a system operator to close down the system
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in an nice way.
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.B Shutdown
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informs the users why and when the system is going down. This warning
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is issued 10 minutes before shutdown time and every minute in the last
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5 minutes. At this time (5 minutes),
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.B shutdown
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creates a file
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.B /etc/nologin
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to prevent new users from logging in.
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.PP
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.B Shutdown
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keeps a logfile of shutdowns. Every shutdown is registered in
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.BR /usr/adm/wtmp ,
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if this file exists, and by
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.BR syslog (3)
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(level
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.BR auth . notice ).
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After these actions, a call is done to
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.BR reboot (2)
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which actually brings the system down.
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.PP
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.I Time-specification
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may be something like
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.BR 15:00 ,
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.BR 15.00 ,
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.BR +15 ,
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or
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.B now
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for a shutdown at 3pm (twice), 15 minutes from now, or immediately.
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.PP
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The message may be used to describe why the system is going down, it may
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also be typed on standard input with the
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.B \-m
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option.
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.SH OPTIONS
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.TP
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.B \-h
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This flag prevents the system from rebooting after the shutdown. The
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system can now be powered off. This is the default.
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.TP
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.B \-r
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This flag indicates that the system should reboot after shutting down.
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.TP
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.B \-R
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Reboot the system by resetting it. Normally the kernel will try to return
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to the Boot Monitor. With
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.B \-R
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the system will receive a hardware reset.
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.TP
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.BI \-x " code"
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Halt the system and let the Monitor execute the given code as if typed at
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the monitor prompt. You can for instance use
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.B "\-x 'boot hd0'"
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as a very fast way to reboot "from the top."
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.TP
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.B \-m
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Allows the operator to type a shutdown message on standard input, that will
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be added to the messages displayed on all terminals.
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.TP
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.B \-k
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This option gives the possibility of terminating an already started
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shutdown. This is only possible if shutdown time has not yet arrived.
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.TP
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.B \-C
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Check if the system crashed. This option is not used at shutdown time,
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but at reboot time. It tells if the file systems should be checked by
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testing if the last entry in the wtmp file is a shutdown entry. (A
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crude replacement for a file system clean flag.)
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.SH "SEE ALSO"
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.BR reboot (2),
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.BR syslog (3),
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.BR halt (8),
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.BR boot (8).
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.SH AUTHOR
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Edvard Tuinder (v892231@si.hhs.NL)
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