linux倒计时关机命令 linux设置指定时间关机指令

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shutdown多少分钟还是多少秒关机 Linux

shutdown命令中-t选项后面linux倒计时关机命令的值并不是关机时间,而是向进程发送警告信号和关闭信号linux倒计时关机命令的间隔时间。

例如命令linux倒计时关机命令：shutdown -t 5 5linux倒计时关机命令，第一个5表示的是向进程发送警告信号和关闭信号的间隔时间为5秒linux倒计时关机命令，但是系统关闭将在5分钟后。

相关问答

Q1: 如何让linux每天晚上11点自动关机？

这里有两种方法linux倒计时关机命令，我试过的，蛮好的，这里有我自己的，也有借鉴别人的方法！

关机命令如下,第一种是将关机作为一种任务,每天自动执行;第二种是若干小时后关机。楼主您自己选择一种吧linux倒计时关机命令：

第一种方法：

使用shutdown定时关机的问题

shutdown: invalid option -- -

Usage: shutdown [-akrhfnc] [-t secs] time [warning message]

-a: use /etc/shutdown.allow

-k: don't really shutdown, only warn.

-r: reboot after shutdown.

-h: halt after shutdown.

-f: do a 'fast' reboot (skip fsck).

-F: Force fsck on reboot.

-n: do not go through "init" but go down real fast.

-c: cancel a running shutdown.

-t secs: delay between warning and kill signal.

** the "time" argument is mandatory! (try "now") **

第二种方法：

用crontab命令就可以了，下面看一下它的详细用法。名称 : crontab 使用权限 : 所有使用者使用方式 : crontab [ -u user ] file crontab [ -u user ] { -l | -r | -e } 说明 : crontab 是用来让使用者在固定时间或固定间隔执行程序之用，换句话说，也就是类似使用者的时程表。-u user 是指设定指定 user 的时程表，这个前提是你必须要有其权限(比如说是 root)才能够指定他人的时程表。如果不使用 -u user 的话，就是表示设定自己的时程表。餐数 : -e : 执行文字编辑器来设定时程表，内定的文字编辑器是 VI，如果你想用别的文字编辑器，则请先设定 VISUAL 环境变数来指定使用那个文字编辑器(比如说 setenv VISUAL joe) -r : 删除目前的时程表 -l : 列出目前的时程表时程表的格式如下 : f1 f2 f3 f4 f5 program 其中 f1 是表示分钟，f2 表示小时，f3 表示一个月份中的第几日，f4 表示月份，f5 表示一个星期中的第几天。program 表示要执行的程序。当 f1 为 * 时表示每分钟都要执行 program，f2 为 * 时表示每小时都要执行程序，其馀类推当 f1 为 a-b 时表示从第 a 分钟到第 b 分钟这段时间内要执行，f2 为 a-b 时表示从第 a 到第 b 小时都要执行，其馀类推当 f1 为 */n 时表示每 n 分钟个时间间隔执行一次，f2 为 */n 表示每 n 小时个时间间隔执行一次，其馀类推当 f1 为 a, b, c,... 时表示第 a, b, c,... 分钟要执行，f2 为 a, b, c,... 时表示第 a, b, c...个小时要执行，其馀类推使用者也可以将所有的设定先存放在档案 file 中，用 crontab file 的方式来设定时程表。例子 : 每月每天每小时的第 0 分钟执行一次 /bin/ls : 0 7 * * * /bin/ls 在 12 月内, 每天的早上 6 点到 12 点中，每隔 20 分钟执行一次 /usr/bin/backup : 0 6-12/3 * 12 * /usr/bin/backup 周一到周五每天下午 5:00 寄一封信给 alex@domain.name : 0 17 * * 1-5 mail -s "hi" alex@domain.name /tmp/maildata 每月每天的午夜 0 点 20 分, 2 点 20 分, 4 点 20 分....执行 echo "haha" 20 0-23/2 * * * echo "haha" 注意 : 当程序在你所指定的时间执行后，系统会寄一封信给你，显示该程序执行的内容，若是你不希望收到这样的信，请在每一行空一格之后加上 /dev/null 21 即可

Q2: shutdown -i怎么设置其他时间比如2小时

shutdown -r +2 表示2分钟后重新启动

shutdown 命令可以安全关闭或者重新启动系统。shutdown命令不仅可以关闭系统、也可以重启Linux系统。

命令语法：

/sbin/shutdown [-t sec] [-arkhncfFHP] time [warning-message]

命令参数：

参数

长参数

描叙

-a

Use /etc/shutdown.allow.

-c

中断关机：当执行"shutdown -h 12:00"指令时，只要按+键就可以中断关机的指令

-f

重新启动时不进行磁盘检测（fsck）

-F

重新启动时进行磁盘检测（fsck）

-h

关闭电源

-k

模拟关机（不是真的关机），只是向登录者发送警告信息出去！

-n

不调用init进程进行关机，而是强行关机

-r

关闭系统然后重新启动，类似于Windows平台restart

-t

延迟关机的时间

-w

仅做测试，并不真的将系统重新开机，只会把重开机的数据写入/var/log目录下的wtmp记录文件

--help

显示命令在线帮助

使用示例：

1: 查看reboot命令的帮助信息

[root@db-server ~]# shutdown --help

shutdown: invalid option -- -

Usage: shutdown [-akrhHPfnc] [-t secs] time [warning message]

-a: use /etc/shutdown.allow

-k: don't really shutdown, only warn.

-r: reboot after shutdown.

-h: halt after shutdown.

-P: halt action is to turn off power.

-H: halt action is to just halt.

-f: do a 'fast' reboot (skip fsck).

-F: Force fsck on reboot.

-n: do not go through "init" but go down real fast.

-c: cancel a running shutdown.

-t secs: delay between warning and kill signal.

** the "time" argument is mandatory! (try "now") **

[root@db-server ~]#

[root@db-server ~]# man shutdown

SHUTDOWN(8) Linux System Administrator钬檚 Manual SHUTDOWN(8)

NAME

shutdown - bring the system down

SYNOPSIS

/sbin/shutdown [-t sec] [-arkhncfFHP] time [warning-message]

DESCRIPTION

shutdown brings the system down in a secure way. All logged-in users are notified that the system is going

down, and login(1) is blocked. It is possible to shut the system down immediately or after a specified delay.

All processes are first notified that the system is going down by the signal SIGTERM. This gives programs like

vi(1) the time to save the file being edited, mail and news processing programs a chance to exit cleanly, etc.

shutdown does its job by signalling the init process, asking it to change the runlevel. Runlevel 0 is used to

halt the system, runlevel 6 is used to reboot the system, and runlevel 1 is used to put to system into a state

where administrative tasks can be performed; this is the default if neither the -h or -r flag is given to shut-

down. To see which actions are taken on halt or reboot see the appropriate entries for these runlevels in the

file /etc/inittab.

OPTIONS

-a Use /etc/shutdown.allow.

-t sec Tell init(8) to wait sec seconds between sending processes the warning and the kill signal, before

changing to another runlevel.

-k Don钬檛 really shutdown; only send the warning messages to everybody.

-r Reboot after shutdown.

-h Halt or poweroff after shutdown.

-H Halt action is to halt or drop into boot monitor on systems that support it.

-P Halt action is to turn off the power.

-n [DEPRECATED] Don钬檛 call init(8) to do the shutdown but do it ourself. The use of this option is dis-

couraged, and its results are not always what you钬檇 expect.

-f Skip fsck on reboot.

-F Force fsck on reboot.

-c Cancel an already running shutdown. With this option it is of course not possible to give the time argu-

ment, but you can enter a explanatory message on the command line that will be sent to all users.

time When to shutdown.

warning-message

Message to send to all users.

The time argument can have different formats. First, it can be an absolute time in the format hh:mm, in which

hh is the hour (1 or 2 digits) and mm is the minute of the hour (in two digits). Second, it can be in the for-

mat +m, in which m is the number of minutes to wait. The word now is an alias for +0.

If shutdown is called with a delay, it creates the advisory file /etc/nologin which causes programs such as

(i.e. it is cancelled or something goes wrong). It also removes it before calling init to change the runlevel.

The -f flag means 钬榬eboot fast钬? This only creates an advisory file /fastboot which can be tested by the sys-

tem when it comes up again. The boot rc file can test if this file is present, and decide not to run fsck(1)

since the system has been shut down in the proper way. After that, the boot process should remove /fastboot.

The -F flag means 钬榝orce fsck钬? This only creates an advisory file /forcefsck which can be tested by the sys-

tem when it comes up again. The boot rc file can test if this file is present, and decide to run fsck(1) with

a special 钬榝orce钬?flag so that even properly unmounted filesystems get checked. After that, the boot process

should remove /forcefsck.

The -n flag causes shutdown not to call init, but to kill all running processes itself. shutdown will then

turn off quota, accounting, and swapping and unmount all filesystems.

ACCESS CONTROL

shutdown can be called from init(8) when the magic keys CTRL-ALT-DEL are pressed, by creating an appropriate

entry in /etc/inittab. This means that everyone who has physical access to the console keyboard can shut the

system down. To prevent this, shutdown can check to see if an authorized user is logged in on one of the vir-

tual consoles. If shutdown is called with the -a argument (add this to the invocation of shutdown in /etc/init-

tab), it checks to see if the file /etc/shutdown.allow is present. It then compares the login names in that

file with the list of people that are logged in on a virtual console (from /var/run/utmp). Only if one of those

authorized users or root is logged in, it will proceed. Otherwise it will write the message

shutdown: no authorized users logged in

to the (physical) system console. The format of /etc/shutdown.allow is one user name per line. Empty lines and

comment lines (prefixed by a #) are allowed. Currently there is a limit of 32 users in this file.

Note that if /etc/shutdown.allow is not present, the -a argument is ignored.

HALT OR POWEROFF

The -H option just sets the init environment variable INIT_HALT to HALT, and the -P option just sets that vari-

able to POWEROFF. The shutdown script that calls halt(8) as the last thing in the shutdown sequence should

check these environment variables and call halt(8) with the right options for these options to actually have

any effect. Debian 3.1 (sarge) supports this.

FILES

/fastboot

/etc/inittab

/etc/init.d/halt

/etc/init.d/reboot

/etc/shutdown.allow

NOTES

A lot of users forget to give the time argument and are then puzzled by the error message shutdown produces.

The time argument is mandatory; in 90 percent of all cases this argument will be the word now.

Init can only capture CTRL-ALT-DEL and start shutdown in console mode. If the system is running the X window

System, the X server processes all key strokes. Some X11 environments make it possible to capture CTRL-ALT-DEL,

but what exactly is done with that event depends on that environment.

Shutdown wasn钬檛 designed to be run setuid. /etc/shutdown.allow is not used to find out who is executing shut-

down, it ONLY checks who is currently logged in on (one of the) console(s).

AUTHOR

Miquel van Smoorenburg, miquels@cistron.nl

正文

shutdown多少分钟还是多少秒关机 Linux

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