Operation and Maintenance
Linux Operation and Maintenance
Can the linux shutdown command shut down immediately?
Can the linux shutdown command shut down immediately?
The Linux shutdown command shutdown can shut down the system immediately. The root user only needs to execute the "shutdown -h now" command. The shutdown command can be used to perform the shutdown process and send messages to all programs being executed by users before shutting down. The shutdown command requires the system administrator root user to use it.
#The operating environment of this tutorial: linux7.3 system, Dell G3 computer.
The Linux shutdown command shutdown can shut down the computer immediately.
Linux commands to shut down immediately are:
shutdown -h nowShut down immediately (for root users)haltShut down immediatelypoweroffShut down immediately
If If you set the shutdown through the shutdown command, you can use the shutdown -c command to cancel the restart
linux shutdown command introduction
The Linux shutdown command can be used to perform the shutdown process and send messages to all programs being executed by the user before shutting down. The shutdown command can also be used to restart the computer.
Usage permissions: System administrator.
grammar
shutdown [-t seconds] [-rkhncfF] time [message]
##Parameter Description：
- ##-t seconds: set after a few seconds Perform the shutdown procedure.
- -k: It does not actually shut down the computer, it just sends a warning message to all users.
- -r : Shut down and then restart.
- #-h : Stop after shutdown.
- #-n: Instead of using normal procedures to shut down, forcefully kill all running programs and then shut down automatically.
- #-c : Cancel the shutdown action currently in progress.
- -f: When shutting down, do not perform fcsk action (check Linux file system).
- #-F: Force fsck action when shutting down.
- #time: Set the shutdown time.
- #message: Warning message sent to all users.
Example
Shut down immediately# shutdown -h now
# shutdown -h 10
Restart the computer # shutdown -r now
Command syntax: 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 Delay shutdown time ##-w # It’s just for testing, it doesn’t really restart the system, it only writes the restarted data The wtmp record file in the /var/log directory 示例： 2：系统2分钟后重新启动，其中+m表示几分钟后关机或开机。 [root@db-server ~]# shutdown -r +2 3：设置系统在那个时间点关机 或后台执行 最好是使用命令 设置多久时间后执行shutdown命令。时间参数有hh：mm或+m两种模式。hh：mm格式表示在几点几分执行shutdown命令。例如 “shutdown 10：45”表示将在10：45执行shutdown.+m表示m分钟后执行shutdown.比较特别的用法是以now表示立即执行shutdown. 值得注意的是这部分参数不能省略。另外，需要注意如果现在已经22:30，你执行了shutdown -h 22:00 & 那么第二天才会关机。 4：查看后台是否执行shutdown命令 5：取消shutdown命令执行 执行了下面命令让Linux在12:30关机，但是如果发现这个时间点不合适，那么可以使用CTRL+C取消。 也可以在另外一个命令窗口执行下面命令 6：向所有登录的用户发出信息 另外登录的会话窗口会收到如下信息 一般使用下面语法，如下所示 7：重新启动时不进行磁盘检测 8：在多少秒后关闭系统并给用户发送提示信息 推荐学习：Linux视频教程 The above is the detailed content of Can the linux shutdown command shut down immediately?. For more information, please follow other related articles on the PHP Chinese website! AI-powered app for creating realistic nude photos Online AI tool for removing clothes from photos. Undress images for free AI clothes remover Swap faces in any video effortlessly with our completely free AI face swap tool! Easy-to-use and free code editor Chinese version, very easy to use Powerful PHP integrated development environment Visual web development tools God-level code editing software (SublimeText3) The five basic components of the Linux system are: 1. Kernel, 2. System library, 3. System utilities, 4. Graphical user interface, 5. Applications. The kernel manages hardware resources, the system library provides precompiled functions, system utilities are used for system management, the GUI provides visual interaction, and applications use these components to implement functions. To view the Git repository address, perform the following steps: 1. Open the command line and navigate to the repository directory; 2. Run the "git remote -v" command; 3. View the repository name in the output and its corresponding address. VS Code One-step/Next step shortcut key usage: One-step (backward): Windows/Linux: Ctrl ←; macOS: Cmd ←Next step (forward): Windows/Linux: Ctrl →; macOS: Cmd → The main uses of Linux include: 1. Server operating system, 2. Embedded system, 3. Desktop operating system, 4. Development and testing environment. Linux excels in these areas, providing stability, security and efficient development tools. Although Notepad cannot run Java code directly, it can be achieved by using other tools: using the command line compiler (javac) to generate a bytecode file (filename.class). Use the Java interpreter (java) to interpret bytecode, execute the code, and output the result. There are six ways to run code in Sublime: through hotkeys, menus, build systems, command lines, set default build systems, and custom build commands, and run individual files/projects by right-clicking on projects/files. The build system availability depends on the installation of Sublime Text. To install Laravel, follow these steps in sequence: Install Composer (for macOS/Linux and Windows) Install Laravel Installer Create a new project Start Service Access Application (URL: http://127.0.0.1:8000) Set up the database connection (if required) Visual Studio Code (VSCode) is a cross-platform, open source and free code editor developed by Microsoft. It is known for its lightweight, scalability and support for a wide range of programming languages. To install VSCode, please visit the official website to download and run the installer. When using VSCode, you can create new projects, edit code, debug code, navigate projects, expand VSCode, and manage settings. VSCode is available for Windows, macOS, and Linux, supports multiple programming languages and provides various extensions through Marketplace. Its advantages include lightweight, scalability, extensive language support, rich features and version/sbin/shutdown [-t sec] [-arkhncfFHP] time [warning-message]
##--help Display command online help
1：马上关闭Linux系统，其中 now 相当于时间为 0 的状态示例：# shutdown -h now
# shutdown -h 12:30
# shutdown -h 12:30 &
&将关机命令至于后台处理。不影响当前其它操作。# jobs
[1]+ Running shutdown -h 08:00 &
# shutdown -h 12:30
Shutdown cancelled.
# shutdown -c
# shutdown -k "now"
Broadcast message from root (pts/2) (Sat Jan 10 20:09:14 2015):
The system is going down to maintenance mode NOW!
Shutdown cancelled.
[root@db-server ~]#
[root@db-server ~]#
Broadcast message from root (pts/2) (Sat Jan 10 20:11:34 2015):
The system is going down to maintenance mode NOW!
[root@db-server ~]# shutdown -k now "The Server will shutdown now
Broadcast message from root (pts/1) (Sat Jan 10 20:14:54 2015):
The Server will shutdown now
The system is going down to maintenance mode NOW!
Shutdown cancelled.
[root@db-server ~]# shutdown -fr now
Broadcast message from root (pts/1) (Sat Jan 10 20:23:59 2015):
The system is going down for reboot NOW!
[root@db-server ~]# shutdown -t 10 -h now "System will shutdown 10 sencond later"
Broadcast message from root (pts/1) (Sat Jan 10 20:33:36 2015):
System will shutdown 10 sencond later
The system is going down for system halt NOW!
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