SHUTDOWN.8
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上传日期:2007-02-01
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操作系统开发
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C/C++
- .TH SHUTDOWN 8
- .SH NAME
- shutdown - graciously close the system down
- .SH SYNOPSIS
- .B shutdown
- .RB [ -hrRmk ]
- .RB [ -x
- .IR code ]
- .RI [ time-specification
- .RI [ message ]]
- .SH DESCRIPTION
- .B Shutdown
- is a program which allows a system operator to close down the system
- in an nice way.
- .B Shutdown
- informs the users why and when the system is going down. This warning
- is issued 10 minutes before shutdown time and every minute in the last
- 5 minutes. At this time (5 minutes),
- .B shutdown
- creates a file
- .B /etc/nologin
- to prevent new users from logging in.
- .PP
- .B Shutdown
- keeps a logfile of shutdowns. Every shutdown is registered in
- .BR /usr/adm/wtmp ,
- if this file exists. After these actions, a call is done to
- .BR reboot (2)
- which actually brings the system down.
- .PP
- .I Time-specification
- may be something like
- .BR 15:00 ,
- .BR 15.00 ,
- .BR +15 ,
- or
- .B now
- for a shutdown at 3pm (twice), 15 minutes from now, or immediately.
- .PP
- The message may be used to describe why the system is going down, it may
- also be typed on standard input with the
- .B -m
- option.
- .SH OPTIONS
- .TP
- .B -h
- This flag prevents the system from rebooting after the shutdown. The
- system can now be powered off. This is the default.
- .TP
- .B -r
- This flag indicates that the system should reboot after shutting down.
- .TP
- .B -R
- Reboot the system by resetting it. Normally the kernel will try to return
- to the Boot Monitor. With
- .B -R
- the system will receive a hardware reset.
- .TP
- .BI -x " code"
- Halt the system and let the Monitor execute the given code as if typed at
- the monitor prompt. You can for instance use
- .B "-x 'boot hd0'"
- as a very fast way to reboot "from the top."
- .TP
- .B -m
- Allows the operator to type a shutdown message on standard input, that will
- be added to the messages displayed on all terminals.
- .TP
- .B -k
- This option gives the possibility of terminating an already started
- shutdown. This is only possible if shutdown time has not yet arrived.
- .TP
- .B -C
- Check if the system crashed. This option is not used at shutdown time,
- but at reboot time. It tells if the file systems should be checked by
- testing if the last entry in the wtmp file is a shutdown entry. (A
- crude replacement for a file system clean flag.)
- .SH FILES
- /usr/adm/wtmp, /etc/nologin, /usr/adm/authlog
- .SH "SEE ALSO"
- .BR reboot (2),
- .BR wall (1),
- .BR halt (8),
- .BR boot (8).
- .SH AUTHOR
- Edvard Tuinder (v892231@si.hhs.NL)