grub-set-default-legacy-ec2 --version (return code: 0)
grub-set-default (GNU GRUB 0.97-29ubuntu60)
grub-set-default-legacy-ec2 --help (return code: 0)
Usage: 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 Use the directory DIR instead of the root directory
ENTRY is a number or the special keyword `default\'.
Report bugs to <bug-grub@gnu.org>.