grub: default
15.1.10 default
---------------
If this variable is set, it identifies a menu entry that should be
selected by default, possibly after a timeout (⇒timeout). The
entry may be identified by number (starting from 0 at each level of the
hierarchy), by title, or by id.
For example, if you have:
menuentry 'Example GNU/Linux distribution' --class gnu-linux --id example-gnu-linux {
...
}
then you can make this the default using:
default=example-gnu-linux
If the entry is in a submenu, then it must be identified using the
number, title, or id of each of the submenus starting from the top
level, followed by the number, title, or id of the menu entry itself,
with each element separated by '>'. For example, take the following
menu structure:
GNU/Hurd --id gnu-hurd
Standard Boot --id=gnu-hurd-std
Rescue shell --id=gnu-hurd-rescue
Other platforms --id=other
Minix --id=minix
Version 3.4.0 --id=minix-3.4.0
Version 3.3.0 --id=minix-3.3.0
GRUB Invaders --id=grub-invaders
The more recent release of Minix would then be identified as 'Other
platforms>Minix>Version 3.4.0', or as '1>0>0', or as
'other>minix>minix-3.4.0'.
This variable is often set by 'GRUB_DEFAULT' (⇒Simple
configuration), 'grub-set-default', or 'grub-reboot'.
Info Catalog
grub: debug
grub: Special environment variables
grub: fallback