If you have scheduled shutdown and you want to cancel it, you can use the -c argument: sudo shutdown -c The command above will reboot the system after 5 minutes and broadcast Updating kernel. You can also specify a time argument and a custom message:You can also specify a time argument and a custom message: shutdown -r +5 'Updating kernel' To reboot the system, use the -r argument: sudo shutdown -r It is important to mention that when specifying a custom wall message, you must specify a time argument too. The following example, will shut down the system in 30 minutes from now and notify the users that a hardware upgrade will be performed: sudo shutdown +30 'Hardware upgrade' To broadcast a custom message along with the standard shutdown notification type your message after the time argument. To shut down your system immediately you can use +0 or its alias now: sudo shutdown now How to Broadcast a Custom Message The following example will schedule system shutdown in 10 minutes from now: sudo shutdown +10 How to Shutdown the System Immediately The following example will schedule system shutdown at 11 A.M: sudo shutdown 11:00 It can be an absolute time in the format hh:mm and relative time in the format +m where m is the number of minutes from now. The time argument can have two different formats. How to Shutdown the System at a Specified Time The shutdown process starts after 1 minute, which is the default time interval. When used with no arguments, the shutdown command will power off the machine. On the recent Linux distributions shutdown is an alias to systemctl and it is available in the system only for compatibility reasons. message- The message argument specifies a message which will be broadcast to all users.time- The time argument specifies when to perform the shutdown process.options- Shutdown options such as halt, power-off (the default option) or reboot the system.The shutdown command expressions take the following form: shutdown

Shutdown Command Syntaxīefore going into how to use the shutdown command, let’s start by reviewing the basic syntax.

You can shut down your system immediately or at the specified time. When the shutdown is initiated, all logged-in users and processes are notified that the system is going down, and no further logins are allowed. The shutdown command brings the system down in a secure way. In this tutorial, we will show you how to use the shutdown command through practical examples and detailed explanations of the most common shutdown options.

Linux shutdown command