[vox-tech] Reinstalling GRUB

[Jonathan Stickel]

Ken Bloom wrote:
> On Tue, Nov 25, 2003 at 11:05:16AM -0800, Robert G. Scofield wrote:
> 
>>Can someone tell me how to reinstall GRUB from the command line?
>>
>>I had to reformat my Windows partition and so GRUB got eaten.  I checked 
>>various documentation, and even asked SuSE Support how to reinstall GRUB, but 
>>no one has given me the answer.  
>>
>>There is a simple command for reinstalling LILO.  If I type /usr/sbin/grub I 
>>get a GRUB> prompt, but then I don't know what to do next.
> 
> 
> There is some way of entering commands at the GRUB commandline that will 
> install grub, but I don't know what it is - /usr/sbin/grub is a copy of 
> the bootloader itself but I don't know what its capabilities are.
> 

Since no one has illustrated this yet, I'll share what little I know. 
I've recently learned to do this from the Gentoo install instructions 
(http://www.gentoo.org/doc/en/gentoo-x86-install.xml).  From shell,

#grub
grub> root (hdX,Y)
grub> setup (hdX)
grub> quit
#

That's it!  hdX,Y is your boot partition (e.g. hd0,0 = /dev/hda1) and 
hdX is where you want grub installed (e.g. MBR of /dev/hda).  The gentoo 
  install instructions gives more details and is very clear.  Also, make 
sure your /boot/grub/grub.conf file is correct.

Some of you may be asking, how do I run grub and fix my boot loader if I 
can't boot into Linux?  Just boot off of a floppy or CD, such as KNOPPIX 
or your Linux installation CD.

Jonathan


> Use the grub-install command which should be in the same directory.
> 
> 
>>I finally figured out how to do it with YAST, and so I'm okay.  But I've seen 
>>too many GNOME and KDE GUI programs fail, and for something as important as 
>>installing a bootloader when Windows is in the neighborhood, I would feel 
>>more secure if I could reinstall GRUB from the command line.
> 
>