Sample output (the command was issued on tty01): You can press or type the following command to cancel a running shutdown: # poweroff How do I Cancel The System Shutdown? You can also type the poweroff command instead of typing shutdown -P: The system is going down for power off in 10 minutes! The -P option requests that the system be powered off after it has been brought down: The -H option requests that the system be halted after it has been brought down: The above will turn the server off at 8:00 PM. The -h option 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: The system is going down for halt in 5 minutes! -h (halt) option In this example, shutdown the system in 5 minutes: Other 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 format. TIME may have different formats, the most common is simply the word now which will bring the system down immediately. All logged-in users are notified that the system is going down and, within the last five minutes of TIME, new logins are prevented. it will remove power from a servers’s main components in a controlled way. The shutdown command arranges for the system to be brought down in a safe way i.e. It also gives them a chance to finish their work before this happens, instead of abruptly being disconnected while having no idea what happened.Open a command-line terminal (select Applications > Accessories > Terminal), or login to remote server using the ssh command, and then type the following command to shutdown the Linux server immediately: This gives them a chance to know in advance why and when the machine will become unavailable. If a few users are logged in to this Linux machine, the wall message will be shown to them before the server reboots or shuts down. You can also set what is called a wall message. To reboot instead, add the -r, reboot option: sudo shutdown -r 02:00 sudo shutdown -r +15 To shutdown after 15 minutes: sudo shutdown +15 If you want to shutdown x minutes later, use +x instead.
The time is in 24-hour format, so you can use anything between 00:00 and 23:59. To shutdown at 02:00 AM: sudo shutdown 02:00 The shutdown command is better suited for scheduled reboots or shutdowns. It’s inconvenient to have to wake up just to reboot some device, so you can instead instruct Linux to do this on its own. You’ll often find that you need to reboot some servers in the middle of the night, say 2 or 3AM. This is exactly like unplugging a computer from its power source. The system reboots instantly, programs have no chance to close properly or save their data. This is exactly like pressing the reset button. If not even this works, you can specify –force twice ( only use as last resort): sudo systemctl reboot -force -force sudo systemctl reboot -force sudo systemctl poweroff -force In such abnormal situations, you can force close all such programs and reboot in a more abrupt way (not recommended to do unless absolutely necessary). That might be because some program is misbehaving, stuck in some way and it does not want to close properly. Rarely, you might find yourself in situations where the system refuses to reboot or shutdown normally.
This applies to all other examples in these lessons where you see sudo. So you can skip writing the “sudo” word if you’re already logged in as root. So a regular user needs to type sudo systemctl reboot instead.Īll you need to remember is this: “If I am logged in as root, I don’t need sudo”. But they can temporarily get root privileges, if they add sudo in front of their commands. Regular users cannot use commands that change the system’s state. So we can reboot a machine by simply typing systemctl reboot. Some commands require system administrator privileges. To reboot or shutdown a Linux machine we’ll often use the systemctl (system control) command.
Linux shutdown command how to#
In this blog we will see how to boot, reboot, and shutdown a system safely in linux.
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