testing a kernel with grub

I have a question on how to test a newly installed kernel with grub as the boot loader.

The grub.conf looks like:

default=1
timeout=10
splashimage=(hd0,0)/grub/splash.xpm.gz

title Red Hat Enterprise Linux ES (2.4.29)
root (hd0,0)
kernel /vmlinuz-2.4.29 ro root=/dev/hda7
initrd /initrd-2.4.29.img

title Red Hat Enterprise Linux ES (2.4.28)
root (hd0,0)
kernel /vmlinuz-2.4.28 ro root=/dev/hda7
initrd /initrd-2.4.28.img
Where the 2.4.28 kernel is the stable version and the 2.4.29 is the new kernel that I want to test, without changing the default from 1 to 0.

Can I simply type:

grub shell
grub> savedefault --default=0 --once
grub> quit
reboot
To get a single boot to the 2.4.29 kernel or do I need to modify the grub.conf somehow first?

Thanks for any advice

 

 

 

 

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