![]() ![]() A boot file is a configuration file that instructs a Linux user on how to boot the system. It is possible to boot a new operating system if you edit this file. Another option is to manually edit /etc/default/grub file. It is also worth noting is that if you've completely hosed your grub.cfg file, you can rebuild it with grub2-mkconfig (e.g., grub2-mkconfig -o /boot/efi/EFI/redhat/grub.cfg). Command line editor is one method that can be used. So, if you find yourself banging your head against your desk because the default boot selection never changes despite following all of the advice you've found, see if you might be modifying the wrong grub.cfg file. To use boot options, append them to the boot command line, as described in Configuring the Installation System at the Boot Menu. For example, under Red Hat, CentOS, and Fedora there is one for legacy boot and one for EFI boot. The option which must be used to create a new entry is -c (short for -create ). ![]() To create a boot entry we must know the location of the EFI system partition and the path of the EFI image to boot. It's also worth noting that there may be multiple grub.cfg files on your system. The efibootmgr utility can be used to create new entries in the EFI boot manager menu. Given that the menu item that you want is number 1 (i.e., the second in the list), run the following command: grub2-set-default 1 Devices in the boot device list occur in the same order as devices listed on the. Grub Customizer, a graphical (Gtk) interface to configure some GRUB 2 settings, can be used to change the default GRUB boot menu order without having to manually edit configuration files, like /etc/default/grub. Start counting from zero to find the number of the menu entries that you want. Possible device names are listed either on the command line or in a file. Step 1: Find the number of your boot selection, as root: grep "^menuentry" /boot/efi/EFI/redhat/grub.cfg This can be done using the GRUB command line tools. ![]()
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