请求帮助的函在线等

来源：蜘蛛抓取(WebSpider) 时间：2017-07-01 16:31 标签： 寻求帮助
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新手求帮助，在线等啊收藏
操作题，想要在今天的1:30让系统自动关机该怎么做
安全牛课堂linux基础培训,内容全面,体系完整,系统掌握安全基础技能,课程讲解深入浅出,
要想知道日是星期几该怎么做
shutdo……
当一个文件属性为为-fwxrwxrwx,则表示这个文件的意义又是什么？讲一个文件的属性改为-rwxr-xr--请问该如何下达命令？
今天考试么。。。目测给“答案”：shutdown - bring the system downSYNOPSIS
shutdown [OPTION]...
TIME [MESSAGE]DESCRIPTION
shutdown arranges for the system to be brought down in a safe way.
All logged-in users are notified that the sys‐
tem is going down and, within the last five minutes of TIME, new logins are prevented.
TIME may have different formats, the most common is simply the word 'now' which will bring the system down immedi‐
valid formats are +m, where m is the number of minutes to wait until shutting down and hh:mm which
specifies the time on the 24hr clock.
If no option is specified, the default action is to bring the system down into single-user mode.
Once TIME has elapsed, shutdown sends a request to the init(8) daemon to bring the system down into the
appropri‐
ate runlevel.
performed by emitting the runlevel(7) event, which includes the new runlevel in the RUNLEVEL environment
variable as well as the previous runlevel (obtained from the environment or from /var/run/utmp) in
An additional INIT_HALT variable may be set, this will contain the value HALT when bringing the system
down for halt and POWEROFF when bringing the system down for power off.OPTIONS
Requests that the system be rebooted after it has been brought down.
Requests that the system be either halted or powered off after it has been brought down, with the choice as
to which left up to the system.
Requests that the system be halted after it has been brought down.
Requests that the system be powered off after it has been brought down.
Cancels a running shutdown.
TIME is not specified with this option, the first argument is MESSAGE.
Only send out the warning messages and disable logins, do not actually bring the system down.
你挂了。这里没人会告诉你的。哦也。。
一道接着一道
若要更改一个文件的拥有者与群组，该用什么命令
不可能了，今天的1:30已经过了。。。。
用法: shutdown [OPTION]... 时间 [信息]使系统关闭。Options:
reboot after shutdown
halt or power off after shutdown
halt after shutdown (implies -h)
power off after shutdown (implies -h)
cancel a running shutdown
only send warnings, don't shutdown
-q, --quiet
reduce output to errors only
-v, --verbose
increase output to include informational messages
display this help and exit
output version information and exit时间 可以使用不同的格式，最常用的是简单的一个单词“now”，其使系统立即关闭。
其它可用的格式有 +m ，此 m是关机前等待的分钟数；hh:mm 其指定以 24 小时制中的时间。已登录的用户被一条发送到他们终端的一条消息警告，您可��包含一条可选的 消息 到此项中。
使用 -k选项可以发送警告而不真的关机。如果给出 时间 ，此命令将留在前端指导关机发生。 可以使用 Control-C 取消它，或者被其他用户以 -c 选项取消。系统默认进入维护状态 (单用户) 模式，你可以使用 -r 或 -h更改此行为，其分别指定系统重启或关闭。-h选项可以进一步由 -H 或 -P来指定伺候是关机还是切断电源。
默认动作由 shutdown脚本决定。
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