grub-reboot

The command line tool "grub-reboot" is a part of the GNU GRUB bootloader system, which is commonly used for managing the boot process on Linux systems.

The purpose of "grub-reboot" is to set the default boot entry temporarily. It allows you to specify which operating system or kernel you want to boot into for a single boot cycle without permanently changing the default boot entry.

Using "grub-reboot," you can select from the available boot options listed in the GRUB menu, typically displayed during system startup. It enables you to bypass the default selection and boot directly into a different entry without manual intervention.

The syntax for using "grub-reboot" is straightforward. You need to provide the index number of the desired boot entry as an argument. This number corresponds to the position of the boot entry in the GRUB menu, starting from zero.

To successfully use "grub-reboot," your system needs to have GRUB installed as the bootloader. On most Linux distributions, this is the default bootloader unless you chose a different option during installation.

This command is especially useful for systems that have multiple operating systems installed, such as dual-boot setups. It offers a convenient way to switch to a different OS without changing the default operating system permanently.

"grub-reboot" is typically executed as a root user or by using "sudo" to gain administrative privileges. This ensures that the bootloader settings can be modified effectively.

It's important to note that "grub-reboot" only changes the default bootloader entry for the immediate boot cycle. Upon restarting, the bootloader will revert to the default entry configured in the GRUB configuration file.

Using "grub-reboot" does not modify any system files or configurations permanently, making it a safe and easy-to-use tool for managing boot options on Linux systems.