grub-set-default - set the default boot entry for GRUB
grub-set-default [OPTION] entry
Set the default boot entry for GRUB. -h, --help print this message and exit -v, --version print the version information and exit --root-directory=DIR expect GRUB images under the directory DIR instead of the root directory ENTRY is a number or a menu item title.
Report bugs to <bug-grub@gnu.org>.