The program grub-mkconfig generates a configuration file for GRUB (see Simple configuration).
grub-mkconfig -o /boot/grub/grub.cfg
grub-mkconfig accepts the following options:
--help
Print a summary of the command-line options and exit.
--version
Print the version number of GRUB and exit.
-o file--output=file
Send the generated configuration file to file. The default is to send it to standard output.