the user for how to proceed. For details, see Section 9.1.1.3, “Editing Menu Entries
during the Boot Procedure” (page 161).
/boot/grub/device.map
This le translates device names from the GRUB and BIOS notation to Linux device
names.
/etc/grub.conf
This le contains the commands, parameters and options the GRUB shell needs
for installing the boot loader correctly.
/etc/sysconfig/bootloader
This le is read by the perl-bootloader library which is used when conguring the
bootloader with YaST and every time a new kernel is installed. It contains congu-
ration options (such as kernel parameters) that will be added by default to the
bootloader conguration le.
GRUB can be controlled in various ways. Boot entries from an existing conguration
can be selected from the graphical menu (splash screen). The conguration is loaded
from the le menu.lst.
In GRUB, all boot parameters can be changed prior to booting. For example, errors
made when editing the menu le can be corrected in this way. Boot commands can also
be entered interactively at a kind of input prompt. For details, see Section 9.1.1.3,
“Editing Menu Entries during the Boot Procedure” (page 161). GRUB offers the possi-
bility of determining the location of the kernel and the initrd prior to booting. In
this way, you can even boot an installed operating system for which no entry exists in
the boot loader conguration.
GRUB actually exists in two versions: as a boot loader and as a normal Linux program
in /usr/sbin/grub. The latter is referred to as the GRUB shell. It provides an em-
ulation of GRUB in the installed system and can be used to install GRUB or test new
settings before applying them. The functionality to install GRUB as the boot loader on
a hard disk or oppy disk is integrated in GRUB in the form of the command setup.
This is available in the GRUB shell when Linux is loaded.
The Boot Loader GRUB 157
