GRUB2 Some Useful Commands

1.background_image

       Load an existing background image. Use tab completion to help complete filename entries!background_image (hd0,1)/usr/share/images/grub/ then tab to display a list of all images. Useful command when initially testing splash images.

2.cat

      Use to display the current file contents. cat /boot/grub/grub.cfg , cat /etc/fstab

3.help

       View all available commands. Type help x to get a list of commands beginning with the letter x.help xxx for information about the xxx command. This command should be preceded by running "set pager=1", which acts like the terminal's "| more" command, to prevent scrolling past the top of the screen.

4.ls

      Used alone, lists all devices known to GRUB 2, such as (hd0) (hd0,1), etc. View available partitions with ls. View /boot and /grub directory contents with `ls /boot, ls /boot/grub

5.initrd

   Load an initrd.

6. linux

    Load a linux kernel.

7. loopback

    Mount a file as a device. `loopback loop (hd0,2)/iso/my.iso

8.lsmod

     Display loaded modules

9.reboot

    Reboot the machine

10. rescue

      Enter the rescue mode

11. set

     Show environmental variables in place. Combined with others, set variables such asset gfxmode=640x480, set color_normal=cyan/black Use the latter command in command line mode to test various menu font colors.

12. vbeinfo

      Display available monitor resolutions.

13.load the configuration file

     configfile (hdX,Y)/boot/grub/grub.cfg