What are GRUB rescue commands?

Posted on by Muna Meyer

What are GRUB rescue commands?

GRUB Rescue Commands

Command Description Example
configfile Load a configuration file. configfile (hd0,1)/boot/grub/grub.cfg
initrd Load the initrd.img file. initrd (hd0,1)/initrd.img
insmod Load a module. insmod (hd0,1)/boot/grub/normal.mod
loopback Mount an image file as a device. loopback loop0 (hd0,1)/iso/image.iso

How use GRUB2 command line?

Using the GRUB2 boot prompt

  1. Load the XFS and LVM modules.
  2. List the drives which GRUB2 sees:
  3. Examine the output to understand the partition table of the /dev/sda device.
  4. Probe each partition of the drive and locate your vmlinuz and initramfs files.
  5. Set the root partition.
  6. Set the desired kernel.
  7. Set the desired initrd .

How do I open a GRUB file?

Open the file with gksudo gedit /etc/default/grub (graphical interface) or sudo nano /etc/default/grub (command-line). Any other plaintext editor (Vim, Emacs, Kate, Leafpad) is fine too. Find the line that starts with GRUB_CMDLINE_LINUX_DEFAULT and add reboot=bios to the end.

How do I edit a GRUB command line?

There is no way to edit a file from the Grub prompt. But you don’t need to do that. As htor and Christopher already suggested, you should be able to switch to a text mode console by pressing Ctrl + Alt + F2 and log in there and edit the file.

How do I find my GRUB kernel?

At the Grub prompt, enter the boot command. If you’ve provided the proper information, then the kernel should take over control and you should see familiar processes scroll and your server boot.

How do I fix grub rescue unknown filesystem?

What to do if grub rescue file system is unknown?

  1. Boot into Windows 10 from the installation media and select the option “Repair your computer”.
  2. Hit the tab of “Troubleshoot” and select “System Restore” to restore it to the restore point you set up before.
  3. You can also try the option of “Automatic Repair”.

Which is the boot loader in rhel7?

GRUB 2
Loading the boot loader (GRUB2) – The default bootloader program used on RHEL 7 is GRUB 2. GRUB stands for GRand Unified Bootloader. GRUB 2 replaces the older GRUB bootloader also called as legacy GRUB.