02-04-2011
Not to be rude but if you understand the microkernel concept, you would grasp more of what is going on. And, also, if I showed you code from an L4 microkernel program would you understand it? The reason I asked the question in such a way is because the info that I'm looking for is mostly universal. And one more thing I'm not modifying the grub source I am booting using grub, you asked for boot environment, I assumed this is what you were talking about.
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LEARN ABOUT CENTOS
grub-reboot
GRUB-REBOOT(8) System Administration Utilities GRUB-REBOOT(8)
NAME
grub-reboot - set the default boot entry for GRUB, for the next boot only
SYNOPSIS
grub-reboot [OPTION] MENU_ENTRY
DESCRIPTION
Set the default boot menu entry for GRUB, for the next boot only.
-h, --help
print this message and exit
-V, --version
print the version information and exit
--boot-directory=DIR
expect GRUB images under the directory DIR/grub instead of the /boot/grub directory
MENU_ENTRY is a number, a menu item title or a menu item identifier. Please note that menu items in submenus or sub-submenus require speci-
fying the submenu components and then the menu item component. The titles should be separated using the greater-than character (>) with no
extra spaces. Depending on your shell some characters including > may need escaping. More information about this is available in the GRUB
Manual in the section about the 'default' command.
REPORTING BUGS
Report bugs to <bug-grub@gnu.org>.
SEE ALSO
grub-set-default(8), grub-editenv(1)
The full documentation for grub-reboot is maintained as a Texinfo manual. If the info and grub-reboot programs are properly installed at
your site, the command
info grub-reboot
should give you access to the complete manual.
grub-reboot (GRUB) 2.02-2ubuntu8.3 July 2018 GRUB-REBOOT(8)