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Operating Systems Linux Ubuntu CentOS, Fedora & RedHat in 1 box Post 302086520 by Perderabo on Thursday 24th of August 2006 12:27:32 PM
Old 08-24-2006
Suppose that CentOS is the default OS, so if the user does not interact with grub, CentOS will boot automaticly. The CentOS startup scripts could fiddle with grub.conf (or use grub's saveddefault concept) so that Redhat is now the default OS. Each OS could arrange for the next OS to be the default in the same way. Now give each OS a cron job that reboots the box, say, every 2 hours. Now the box will cycle through all of the OS's in turn every 2 hours. Maybe that would be good enough.
 

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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)
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