centos update-grub

1. How do I update grub?
2. How do I change GRUB bootloader?
3. How do I update grub2 config?
4. Where is GRUB config file in Centos?
5. How do I regenerate GRUB config?
6. How do I check my grub version?
7. What are the grub commands?
8. How do I remove GRUB bootloader?
9. How do I remove GRUB bootloader from BIOS?

How do I update grub?

Phase 1 - Note: don't use a Live CD.

1. In your Ubuntu open a terminal (press Ctrl + Alt + T at the same time)
2. Make the changes you would like to make and save them.
3. Close gedit. Your terminal should still be open.
4. In the terminal type sudo update-grub , wait for the update to finish.
5. Reboot your computer.

How do I change GRUB bootloader?

Once installed, search for Grub Customizer in the menu and open it.

1. Start Grub Customizer.
2. Select Windows Boot Manager and move it to the top.
3. Once Windows is on the top, save your changes.
4. Now you'll boot into Windows by default.
5. Reduce the default boot time in Grub.

How do I update grub2 config?

To have your changes take effect, simply save the text file — File > Save in Gedit or Ctrl + O and then Enter to save the file in Nano — and then run the sudo update-grub command. Your changes will become part of the grub. cfg file and will be used each time you boot your computer.

Where is GRUB config file in Centos?

The GRUB 2 configuration file is /boot/grub2/grub. cfg.

How do I regenerate GRUB config?

Rebuild the grub.cfg file by running the grub2-mkconfig -o command as follows:

1. On BIOS-based machines, issue the following command as root : ~]# grub2-mkconfig -o /boot/grub2/grub.cfg.
2. On UEFI-based machines, issue the following command as root : ~]# grub2-mkconfig -o /boot/efi/EFI/redhat/grub.cfg.

How do I check my grub version?

To determine your version, use grub-install -V. Grub version 1.99 became the default on Ubuntu 11.04 (Natty Narwhal) and introduced some major changes in the Grub file contents.

What are the grub commands?

If you forget a command, you can run the command help (see help).

• blocklist: Get the block list notation of a file.
• boot: Start up your operating system.
• cat: Show the contents of a file.
• chainloader: Chain-load another boot loader.
• cmp: Compare two files.
• configfile: Load a configuration file.
• debug: Toggle the debug flag.

How do I remove GRUB bootloader?

Remove GRUB bootloader from Windows

1. Step 1(optional): Use diskpart to clean disk. Format your Linux partition using Windows disk management tool. ...
2. Step 2: Run Administrator Command Prompt. ...
3. Step 3: Fix MBR bootsector from Windows 10.

How do I remove GRUB bootloader from BIOS?

Type "rmdir /s OSNAME" command, where OSNAME will be replaced by your OSNAME, to delete the GRUB bootloader from your computer. If prompted press Y. 14. Exit the command prompt and restart the computer the GRUB bootloader is not longer available.