GNU GRUB is a work in progress and the information in this website is incomplete and may be wrong and/or out of date. Please consult the official GNU GRUB 1.98-r2692 manual. By commands grub-install - Install or refresh GRUB2, runs other commands grub -mkconfig - make a new grub.cfg file grub-set-default - tell GRUB which OS title you want to be highlighted by default grub-mkrescue - makes a boot