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landing/docs/Linux-Commands/System/058-the-reboot-command.md

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+# The `reboot` Command
+
+The `reboot` command is used to restart a linux system. However, it requires elevated permission using the [sudo](https://github.com/bobbyiliev/101-linux-commands-ebook/blob/main/ebook/en/content/051-the-sudo-command.md) command. Necessity to use this command usually arises after significant system or network updates have been made to the system.
+
+## Syntax
+```
+reboot [OPTIONS...]
+```
+
+### Options
+- **–help** : This option prints a short help text and exit.
+- **-halt** : This command will stop the machine.
+- **-w**, **–wtmp-only** : This option only writes wtmp shutdown entry, it do not actually halt, power-off, reboot.
+
+### Examples
+1. Basic Usage. Mainly used to restart without any further details
+```
+$ sudo reboot
+```
+However, alternatively the shutdown command with the `-r` option
+```
+$ sudo shutdown -r now
+```
+
+**Note** that the usage of the reboot, halt and power off is almost similar in syntax and effect. Run each of these commands with –help to see the details.
+
+2. The `reboot` command has limited usage, and the `shutdown` command is being used instead of reboot command to fulfill much more advance reboot and shutdown requirements. One of those situations is a scheduled restart. Syntax is as follows
+```
+$ sudo shutdown –r [TIME] [MESSAGE]
+```
+Here the TIME has various formats. The simplest one is `now`, already been listed in the previous section, and tells the system to restart immediately. Other valid formats we have are +m, where m is the number of minutes we need to wait until restart and HH:MM which specifies the TIME in a 24hr clock.
+
+**Example to reboot the system in 2 minutes**
+```
+$ sudo shutdown –r +2
+```
+
+**Example of a scheduled restart at 03:00 A.M**
+```
+$ sudo shutdown –r 03:00
+```
+3. Cancelling a Reboot. Usually happens in case one wants to cancel a scheduled restart
+
+**Syntax**
+```
+$ sudo shutdown –c [MESSAGE]
+```
+**Usage**
+```
+$sudo shutdown -c "Scheduled reboot cancelled because the chicken crossed the road"
+```
+
+4. Checking your reboot logs
+```
+$ last reboot
+```