grub2-set-default for nested systems?

[Jonnycat5000]

Hello, When using grub2-set-default, it is an easy matter to set the default OS by number, but how do I select a nested OS? These are the OSs listed under the various "advanced options" listings.

I saw this information on a webpage last week, but of course I can't find it now. IIRC, it was something like "grub2-set-default x,y" (but of course that's not it).

Anyone know what the correct syntax is for the nested systems, using the number starting from "0"?

Thanks!

[oldfred]

Welcome to the forums.

drs305 suggests using the title (exactly) as one way.

https://help.ubuntu.com/community/Grub2/Submenus

http://ubuntuforums.org/showthread.php?p=10720316

[Jonnycat5000]

Thanks Fred, it looks like the correct syntax is as follows:

grub2-set-default "x>y"

BTW: The quotation marks are required for this to work.