GRUB2#

GRUB2: GRand Unified Bootloader version 2

Config file: /etc/default/grub

Default config:

[root@rhel9-a ~]# nl /etc/default/grub 
     1  GRUB_TIMEOUT=1
     2  GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
     3  GRUB_DEFAULT=saved
     4  GRUB_DISABLE_SUBMENU=true
     5  GRUB_TERMINAL_OUTPUT="console"
     6  GRUB_CMDLINE_LINUX="biosdevname=0 no_timer_check vga=792 nomodeset text resume=/dev/mapper/rhel_rhel9-swap rd.lvm.lv=rhel_rhel9/root rd.lvm.lv=rhel_rhel9/swap net.ifnames=0"
     7  GRUB_DISABLE_RECOVERY="true"
     8  GRUB_ENABLE_BLSCFG=true

GRUB2 docs are texinfo docs (there's no man page for grub2 specifically on RHEL...), pinfo grub2 navigate to Simple configuration to see documentation for /etc/default/grub config options.

References#

Arch: GRUB