Linux shutdown: commands for shutting down and restart­ing Linux

“Shutdown” refers to the process of stopping and shutting down a computer or server. This involves cutting the power to the main com­po­nents of the system using a con­trolled process. Ap­pli­ca­tions are closed, active processes and protocols are saved to the hard drive, device drivers are removed, and user settings are saved in the process. Linux operating systems can easily be stopped, shut down, and restarted using the shutdown command and its various options. Linux shutdown commands are entered in the Linux terminal that is launched by using the keyboard shortcut [Ctrl] + [Alt] + [T]. You can then close the terminal window with the shortcut [Ctrl] + [D].

When shutting down or restart­ing Linux via the terminal, the “shutdown” command is essential. You can add an option to it followed by a time spec­i­fi­ca­tion and a message. The syntax of the Linux shutdown command is as follows:

There is at least one al­ter­na­tive for each command listed here that produces the same result.

Linux will shut down in under a minute. The “-h” option ex­plic­it­ly stands for the shutting down or powering off of a system. You can usually produce the same results by just entering the shutdown command on its own.

Linux will be restarted in under a minute. The “-r” option stands for reboot or restart.

Linux will im­me­di­ate­ly be shut down. In this case, the shutdown command is followed by the “-h” option and the time spec­i­fi­ca­tion “0” which means im­me­di­ate­ly. The following is another far more common command for shutting down Linux im­me­di­ate­ly:

Linux will im­me­di­ate­ly be restarted. In this case, the shutdown command is followed by the “-r” option and the time spec­i­fi­ca­tion “0” which means im­me­di­ate­ly. The following is a fre­quent­ly used command for restart­ing Linux im­me­di­ate­ly:

The standard Linux shutdown command with the one-minute time delay is es­pe­cial­ly useful for multi-user solutions (i.e. when multiple users are accessing a Linux computer or server). In this situation, the network ad­min­is­tra­tor is able to set up a warning message as a wall message to inform users that the system will be shut down or restarted shortly. If Linux is only being used on a single computer, the commands for im­me­di­ate­ly shutting down or im­me­di­ate­ly restart­ing Linux are usually just as simple.

You can also easily schedule Linux shutdowns or restarts to occur after a certain period of time or at a certain time. To do this, you have to add the number of minutes or the time after the cor­re­spond­ing Linux shutdown command, as shown in the examples below:

Linux will shut down 20 minutes after the command is entered. The following command is sometimes more commonly used and produces the same result:

Linux will restart 20 minutes after the command is entered. You can also use the plus sign with this command.

Time spec­i­fi­ca­tion is based on the 24-hour format in Linux in ac­cor­dance with the syntax (hh:mm). In this example, Linux is shut down at 5:30 p.m. (i.e. 17:30). Once again, you can omit the “-h” option which stands for the shutting down or powering off of a system:

Linux will restart at 5:30 p.m. (i.e. 17:30). In this case, the “-r” option, which stands for “reboot”, obviously cannot be omitted – otherwise, Linux would shut down without rebooting.

In addition to the pre­vi­ous­ly mentioned Linux shutdown commands, there are a number of other commands and options for stopping, shutting down, and restart­ing Linux operating systems. These can generally also be combined with commands for scheduled Linux shutdowns.

This command ex­plic­it­ly indicates that the system will be shut down and the main power supply will be cut off.

A wall message is in­for­ma­tion that is displayed on the screen of the operating system users. For example, an ad­min­is­tra­tor can use a wall message to inform users that the system is being shut down.

Using this command, you can cancel a scheduled shutdown or restart. This requires that the process has not yet started.

Using simple commands in the Linux terminal, you can stop, shut down, and restart your operating system. As an al­ter­na­tive to entering Linux shutdown commands directly, you can install a graphical user interface using software, such as the program shutdown which is es­pe­cial­ly suited to the Linux dis­tri­b­u­tion Ubuntu.