GRUB: grub2-set-default without Submenu (1st level)

$ grep "menuentry" /boot/grub2/grub.cfg | cut -d "'" -f2
$ grub2-set-default 'Fedora, with Linux 3.16.3-200.fc20.x86_64'
$ grub2-editenv list

GRUB: grub2-set-default within Submenu

$ grep "submenu\|^\smenuentry" /boot/grub2/grub.cfg | cut -d "'" -f2
$ grub2-set-default 'Advanced options for Fedora release 17 (Beefy Miracle) (on /dev/sda1)>Fedora Linux, with Linux 3.3.4-5.fc17.x86_64 (on /dev/sda1)'
$ grub2-editenv list

！注意！
如果選項在 submenu
要有 ">" ，代表 3.3.4-5.FC17 @ "Advance options for Fedora release 17" SubMenu 之內, 且字串要完整

!!Note!!
If your default-options are located in submenu,
you shall make the string like 'submenu>menuentry', and,
there is a '>' between submenu and entry.

Besides, the set-default have to be "Full" SubMenu/Entry String.

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