Refer to Section 9.7, “GRUB Menu Configuration File” for more information on configuring this 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 before 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 system. The Esc key discards any changes and reloads the standard menu interface. The c key loads the 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 advanced 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.

Refer to Section 9.6, “GRUB Commands” for a list of common commands.