update-grub2 --version (return code: 0)
grub-mkconfig (GRUB) 2.02~beta2-36ubuntu3.7
update-grub2 --help (return code: 0)
Usage: grub-mkconfig [OPTION]
Generate a grub config file
-o, --output=FILE output generated config to FILE [default=stdout]
-h, --help print this message and exit
-v, --version print the version information and exit
Report bugs to <bug-grub@gnu.org>.