GRUB Queries ?! Post: 302884127

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Operating Systems Linux Debian GRUB Queries ?! Post 302884127 by sreyan32 on Friday 17th of January 2014 02:38:22 PM

01-17-2014

Registered User

Quote:

Originally Posted by Corona688

GRUB is often packaged by distributions to make it easier to install and upgrade.

GRUB's very reason to exist is because it uses configuration files instead of finicky bits hardcoded inside the MBR or some other hard-to-access disk location. That's quite a feat for a mere bootloader -- reading files generally needs the OSes help. That's what makes GRUB so big and complicated (for a bootloader, anyway). That's also what makes grub so flexible.

Other bootloaders like lilo cannot actually access files before anything boots. It must cache its configuration in the MBR or some other difficult-to-read place before before it will take effect.

GRUB usually uses Windows' bootloader to load Windows. It doesn't have to overwrite it due to the way Windows stores it. A simple 'chainloader' command tells grub to load the MBR from the Windows partition and it can handle itself from there.

Sir, you didn't tell me why various distributions are provided for various OSes. Like Debian has its own version of GRUB which is different from Fedora. If GRUB can boot all Linux why cant there be only one single universal GRUB for all Linux ?

Also why does GRUB need to read the configuration files of Linux ? It doesn't do so with Windows so why can't it do the same for Linux ?

Also what is the difference between the GRUB offered at-:
GNU GRUB - Obtaining GRUB
and the GRUB that comes with every Linux distribution ?

---------- Post updated at 01:08 AM ---------- Previous update was at 01:03 AM ----------

Quote:

Originally Posted by hicksd8

I'm not the Grub expert that you are looking for but maybe I'll say a few things that might help. My forte is Solaris, SCO and Linux (but not boot loaders).

However, I have had to deal with a number of boot failures under Linux and Linux Appliances (eg, RSA boxes) so I know that Grub errors and corruptions can be fixed ("re-installed" boot loader).

Here's a link:

301 Moved Permanently

Also there's a project on the internet called Super Grub Disk (with a later version called Super Grub2 Disk) which provides all kinds of tools for Grub. I never go into battle against Grub without their bootable CD in my toolkit.

Also, Super Grub Disk To The Rescue! - What's a GRUB? - Tutorials - LinuxPlanet

Hope that helps and I hope that you get other responses.

Sir, I know that SuperGRUB can repair GRUB but can it install GRUB on a system without a Linux bootloader ?

sreyan32

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LEARN ABOUT DEBIAN

grub-install

GRUB-INSTALL(8) 							FSF							   GRUB-INSTALL(8)

NAME

       grub-install - install GRUB on your drive

SYNOPSIS

       grub-install [OPTION] install_device

DESCRIPTION

       Install GRUB on your drive.

       -h, --help
	      print this message and exit

       -v, --version
	      print the version information and exit

       --root-directory=DIR
	      install GRUB images under the directory DIR instead of the root directory

       --grub-shell=FILE
	      use FILE as the grub shell

       --no-floppy
	      do not probe any floppy drive

       --force-lba
	      force GRUB to use LBA mode even for a buggy BIOS

       --recheck
	      probe a device map even if it already exists

       INSTALL_DEVICE can be a GRUB device name or a system device filename.

       grub-install  copies GRUB images into the DIR/boot directory specfied by --root-directory, and uses the grub shell to install grub into the
       boot sector.

REPORTING BUGS

       Report bugs to <bug-grub@gnu.org>.

SEE ALSO

       grub(8), update-grub(8).

       The full documentation for grub-install is maintained as a Texinfo manual in the grub-legacy-doc package.  If  the  info  and  grub-install
       programs are properly installed at your site, the command

	      info grub-install

       should give you access to the complete manual.

grub-install (GNU GRUB 0.97)					   January 2013 						   GRUB-INSTALL(8)