GRUB Queries ?! Post: 302883856

Sponsored Content

Operating Systems Linux Debian GRUB Queries ?! Post 302883856 by Corona688 on Thursday 16th of January 2014 10:57:14 AM

01-16-2014

Registered User

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.

Last edited by Corona688; 01-16-2014 at 12:02 PM..

This User Gave Thanks to Corona688 For This Post:

Corona688

View Public Profile for Corona688

Visit Corona688's homepage!

Find all posts by Corona688

9 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

Some queries...

Guys need some advice on how to check some of the questions below? i'm running on an open VMS platform... which i am an idiot to... appreciate if anyone can give some hints or source on how to check on.. a script that is running on cron job... but doesn't run as the login user name.. 1. why...

2. UNIX for Dummies Questions & Answers

grub problem- keeps rebooting as soon as it tries to do grub

Hi, I installed solaris 10 a few weeks ago. It was working fine during the past two weeks. However, now when I start to load to the drive, I get this problem: The BIOS screen comes up like normal, then screen goes blank and a message "Grub loading stage 2" flashes real quick then the computer...

3. Shell Programming and Scripting

my queries

hi guys Well, i need to have a report generation script or any script which will show me all the content/information of a file when i run that script. Please help me on this isssue at the earliest.As i am little bit aware of scripting.Thanks in advance! regards ash

4. Homework & Coursework Questions

Queries

Any help on like where to get started on this? I'm just confused. 1. The problem statement, all variables and given/known data: Enter text here.Queries to satisfy these two report requests (use your CCI database): Retrieve all rows of active inventory where current on hands is less than...

5. Red Hat

Can we specify which grub.conf to use in grub-install.

Hi, Can we specify which grub.conf to use while installing grub on RHEL. We are working on application which requires different grub configurations needed, depending on certain criteria we need to update grub with correct grub.conf. Can we use grub-install for this purpose?

6. Programming

Combine 3 queries

can these 3 be combined into 1 query? createtablea1as selecta.tps_Res_nb, b.tkt_prod_cd, b.tkt_prod_typ_nm, b.prod_intrnl_ds, b.tkt_prod_typ_nm AS TKT_ENTL_NM, casewhen b.tkt_prod_nm isnotnullthen b.tkt_prod_nm when b.tkt_prod_nm isnulland b.prod_intrnl_ds isnotnullthen...

7. UNIX for Advanced & Expert Users

How many DNS queries

Is there any way to see how many queries come into our external DNS server? In looking at DNS providers, most of them base pricing on number of queries per month so I just wanted to see if you had any idea/way of gathering that data? A rough ballpark figure would even work. Our DNS server is...

8. UNIX for Dummies Questions & Answers

"/boot/grub/grub.conf" VS "/etc/grub.conf"

can someone please explain me the difference between these two files: "/boot/grub/grub.conf" and "/etc/grub.conf" ..

9. Shell Programming and Scripting

Crontab queries

Hi Expert, How to schedule a job on last day of the month. Need your kind help. Regards, PK

LEARN ABOUT CENTOS

grub-editenv

GRUB-EDITENV(1) 						   User Commands						   GRUB-EDITENV(1)

NAME

       grub-editenv - edit GRUB environment block

SYNOPSIS

       grub-editenv [OPTION...] FILENAME COMMAND

DESCRIPTION

       Tool to edit environment block.

	      Commands:

       create Create a blank environment block file.

       list   List the current variables.

       set [NAME=VALUE ...]
	      Set variables.

       unset [NAME ...]
	      Delete variables.

       -?, --help
	      give this help list

       --usage
	      give a short usage message

       -v, --verbose
	      print verbose messages.

       -V, --version
	      print program version

	      Options:

       If FILENAME is `-', the default value /boot/grub/grubenv is used.

       There is no `delete' command; if you want to delete the whole environment block, use `rm /boot/grub/grubenv'.

REPORTING BUGS

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

SEE ALSO

       grub-reboot(8), grub-set-default(8)

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

	      info grub-editenv

       should give you access to the complete manual.

grub-editenv (GRUB) 2.02-2ubuntu8.3				     July 2018							   GRUB-EDITENV(1)