Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Scaricare il pdf (Pagina 83)

Chapter 4. GRUB 83

• kernel kernel-file-name option-1 option-N — Speciﬁes the kernel ﬁle to

load from GRUB’s root ﬁlesystem when using direct loading to boot the operating system. Options

can follow the kernel command and will be passed to the kernel when it is loaded.

For Red Hat Linux, an example kernel command looks like the following:

kernel /vmlinuz root=/dev/hda5

This line speciﬁes that the vmlinuz ﬁle is loaded from GRUB’s root ﬁlesystem, such as (hd0,0).

An option is also passed to the kernel specifying that the root ﬁlesystem for the Linux kernel when

it loads should be on hda5, the ﬁfth partition on the ﬁrst IDE hard drive. Multiple options may be

placed after this option, if needed.

• root

device-and-partition — Conﬁgures GRUB’s root partition to be the particular de-

vice and partition, such as (hd0,0), and mounts the partition so that ﬁles can be read.

• rootnoverify

device-and-partition — Does the same thing as the root command but

does not mount the partition.

Commands other than these are available. Type info grub for a full list of all commands.

4.5. The Menu Conﬁguration File

The conﬁguration ﬁle, which is used to create the list in GRUB’s menu interface of operating systems

to boot, essentially allows the user to select a pre-set group of commands to execute. The commands

given in Section 4.4 can used, as well as some special commands that may only be used in the conﬁg-

uration ﬁle.

4.5.1. Special Conﬁguration File Commands

The following commands can only be used in the GRUB menu conﬁguration ﬁle:

• color

normal-color selected-color — Allows for the set up speciﬁc colors to be

used in the menu, where two colors are conﬁgured as the foreground and background. Use simple

color names, such as red/black. For example:

color red/black green/blue

• default

title-name — The default entry title name that will be loaded if the menu interface

times out.

• fallback

title-name — If used, the entry title name to try if ﬁrst attempt fails.

• hiddenmenu — If used, prevents the GRUB menu interface from being displayed, loading the

default entry when the timeout period expires. The user can see the standard GRUB menu by

pressing the [Esc] key.

• password password — If used, prevents the user who does not know the password from

editing the entries for this menu option.

Optionally, it is possible to specify an alternate menu conﬁguration ﬁle after the

password , so

that, if the password is known, GRUB will restart the second stage of the boot loader and use this

alternate conﬁguration ﬁle to build the menu. If this alternate ﬁle is left out of the command, then a

user who knows the password would be able to edit the current conﬁguration ﬁle.

• timeout — If used, sets the interval, in seconds, before GRUB loads the entry designated by the

default command.

• splashimage — Speciﬁes the location of the splash screen image to be used when GRUB boots.

• title — Sets a title to be used with a particular group of commands used to load an operating

system.

The # character can be used to place comments in the menu conﬁguration ﬁle.

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Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Pagina 83

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