update-grub help

[Goh Lip]

On Sat, 29 May 2010 03:55:01 +0800
Goh Lip <g.lip at gmx.com> wrote:

> On Fri, 28 May 2010 14:58:29 -0400
> Tom H <tomh0665 at gmail.com> wrote:


> 
> Tom, you can try this out, edit one of the grub entry, as an example
> in the following lines...
> 
> set root='(hd0,5)' 
> search --no-floppy --fs-uuid --set xxxxxxxxxxxxxx
> 
> edit it to.....
> set root='(hd0,x)'           {where x is any other number, not 5}
> search --no-floppy --fs-uuid --set xxxxxxxxxxxxxx {this line
> unchanged}
> 
> 
> You will still be able to boot okay as though there had been no
> changes. This is because the 2nd line, search --no-floppy xxxxxx,
> will set the partition specified by the uuid to root, which in this
> example, (hd0,5). whatever the first line says.

Further to this...
If you remove the 2nd line and leave only the first line, then 
set root='(hd0,x)' 
will set (hd0,x) to 'root' (not /) and if (hd0,x) is wrong then it will
not boot.

You can leave out the first line totally and just have the 
search --no-floppy --fs-uuid --set xxxxxxxxxxxxxx    to boot.

You  have noted this yourself in one of your earlier messages in another
thread.

Regards - Goh Lip




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