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. Typehelpxto get a list of commands beginning with the letter x.helpxxxfor 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 withls. View /boot and /grub directory contents with `ls /boot, ls /boot/grub

5.initrd

Load aninitrd.

6. linux

Load alinuxkernel.

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 assetgfxmode=640x480,setcolor_normal=cyan/blackUse 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