grub-set-default:tldr:e6589

The command you provided:

sudo grub-set-default --boot-directory ${-path-to-boot_directory} ${entry_number}

• sudo: It is a command in Linux that allows users to run programs with the security privileges of another user, typically the superuser (or root user). In this case, it is used to run the grub-set-default command with elevated privileges to modify the GRUB bootloader configuration.

• grub-set-default: It is a GRUB utility command used to change the default boot entry to be used during system startup.

• --boot-directory ${-path-to-boot_directory}: This is an option passed to the grub-set-default command specifying the path to the boot directory. The ${-path-to-boot_directory} placeholder should be replaced by the actual path to the boot directory on your system. This option lets grub-set-default know where to find the boot configuration files.

• ${entry_number}: This is another placeholder that should be replaced by the desired boot entry number. In GRUB, each boot entry on the bootloader menu has a number assigned to it. By specifying the entry number, you are instructing grub-set-default to set the default boot entry to the one corresponding to that number.

Overall, this command is used to change the default boot entry in GRUB, with the ability to specify the path to the boot directory and the desired boot entry number.