Installation guide

terfaces allows users to boot the Linux kernel or another operating system.

The interfaces are as follows:

Note

The following GRUB interfaces can only be accessed by pressing any key within

the three seconds of the GRUB menu bypass screen.

Menu Interface

This is the default interface shown when GRUB is configured by the installation program. A

menu of operating systems or preconfigured kernels are displayed as a list, ordered by

name. Use the arrow keys to select an operating system or kernel version and press the

Enter key to boot it. If you do nothing on this screen, then after the time out period expires

GRUB will load the default option.

Press the e key to enter the entry editor interface or the c key to load a command line inter-

face.

Refer to Section 7, “GRUB Menu Configuration File” for more information on configuring this

interface.

Menu Entry Editor Interface

To access the menu entry editor, press the e key from the boot loader menu. The GRUB

commands for that entry are displayed here, and users may alter these command lines be-

fore booting the operating system by adding a command line (o inserts a new line after the

current line and O inserts a new line before it), editing one (e), or deleting one (d).

After all changes are made, the b key executes the commands and boots the operating sys-

tem. The Esc key discards any changes and reloads the standard menu interface. The c

key loads the command line interface.

Tip

For information about changing runlevels using the GRUB menu entry editor,

refer to Section 8, “Changing Runlevels at Boot Time”.

Command Line Interface

The command line interface is the most basic GRUB interface, but it is also the one that

grants the most control. The command line makes it possible to type any relevant GRUB

commands followed by the Enter key to execute them. This interface features some ad-

vanced shell-like features, including Tab key completion based on context, and Ctrl key

combinations when typing commands, such as Ctrl-a to move to the beginning of a line and

Ctrl-e to move to the end of a line. In addition, the arrow, Home, End, and Delete keys

work as they do in the bash shell.

5. GRUB Interfaces