root.
windowsmenuentry
/etc/grub2-efi.cfg
/boot/efi/efi/grub.cfg
vim /etc/grub2-efi.cfg
### BEGIN /etc/grub.d/30_os-prober ###
menuentry ‘Windows Boot Manager (on /dev/sdb1)‘ --class windows --class os $menuentry_id_option
...
windowsmenuentry”Windows Boot Manager (on /dev/sdb1)”
三、/boot/grub2/grubenvsaved_entrywindowsmenuentry:
vim /boot/grub2/grubenv
saved_entry=Windows Boot Manager (on /dev/sdb1)
windows.
原文：https://www.cnblogs.com/lankaxing/p/9347577.html