Fedora – How to change boot sequence -Grub2

Update
Works with Fedora 17

This is for dual boot os users, there are many who prefers dual boot to keep another OS optional. For any reason if you wish to change boot sequence unlike grub, grub2 requires couple of commands to run.

Here will take example to keep Windows as default boot.
First of all find menuentry for Windows

cat /boot/grub2/grub.cfg |grep Windows

result:-

menuentry "Windows 7 (loader) (on /dev/sda1)" --class windows --class os {

Set Windows menuentry as default (only entry mentioned in either " or ' from above command)

grub2-set-default "Windows 7 (loader) (on /dev/sda1)"

Verify default entry

grub2-editenv list

Generate updated grub.cfg

grub2-mkconfig -o /boot/grub2/grub.cfg

Below is to set Fedora as default boot

cat /boot/grub2/grub.cfg |grep Fedora
grub2-set-default "Fedora Linux, with Linux 3.1.0-5.fc16.i686"
grub2-editenv list
grub2-mkconfig -o /boot/grub2/grub.cfg

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Update 2011-12-29
This one is dirty way to achieve purpose. Especially if above does not works.
e.g following err faced by one of commenter.

grub2-mkconfig -o /boot/grub2/grub.cfg
/sbin/grub2-probe: error: cannot stat `/dev/root’.

You need to do this after every new kernel installation, as it may change default entry.

vim /boot/grub2/grub.cfg
#replace
set default="${saved_entry}"
#with
set default="2"

Now check on reboot, third boot entry should be default for booting.
for grub first entry is 0, second is 1, third is 2 & so on.

To keep default=2 permanent even after new kernel installation
vim /etc/default/grub
#replace
GRUB_DEFAULT=saved
#with
GRUB_DEFAULT=2