All changes that you make at boot time are temporary. GRUB does not update the
configuration file. To make your changes permanent, boot the system, and use a text editor
to modify the entries in /boot/grub/grub.conf
.
When booting a system, you can access the GRUB menu by pressing a key before the timeout
expires. GRUB displays the title entries from the /boot/grub/grub.conf
file, and highlights the default entry. You can use the up and down arrow keys to choose a
different entry and press Enter
to boot it.
If you have set a GRUB password, you must press P
and enter the valid
password to be able to edit the titles or change kernel boot parameters. To edit any of the
root
, kernel
, or initrd
directives, press E
. To edit the kernel directive only, press
A
. To use the GRUB command line, press C
.
If you press E
, select the root
,
kernel
, or initrd
directive, and press
E
to edit it. Initially, the entry cursor is placed at the end of the
directive. Use the Home
, End
, and left and right arrow
keys to move through the line. Use the Backspace
and
Delete
keys to erase characters, and type in your changes at the cursor
position. Press Enter
to save your changes or press
Esc
to discard them. Press B
to start the boot
sequence using the changes that you have made.
If you press A
, you can edit the root
directive.
Initially, the entry cursor is placed at the end of the directive. Use the
Home
, End
, and left and right arrow keys to move
through the line. Use the Backspace
and Delete
keys to
erase characters, and type in your changes at the cursor position. Press
Enter
to save your changes and boot the system or press
Esc
to discard the changes.
If you press C
, you can enter GRUB commands. Enter
help
to see a list of commands. Enter help
to see more information about a specified
command.command
For more information, enter the info grub command to access the GRUB manual.