GRUB

Grub 2

• command that generates and prints out configuration:

grub-mkconfig

• save configuration

grub-mkconfig -o /boot/grub/grub.cfg

• get OS's list of labels

grep ^menuentry /boot/grub2/grub.cfg | cut -d "'" -f2
Fedora
Ubuntu 12.04.2 LTS (12.04)
Gentoo Base System release 2.1

• show actual default entry

grub2-editenv list
saved_entry=Fedora Linux, with Linux 3.6.6-1.fc17.i686.PAE

• alter default entry

grub2-set-default "Gentoo Base System release 2.1"

• check...

grub2-editenv list
saved_entry=Gentoo Base System release 2.1

Grub 1.X

Link a una documentazione...

Installing GRUB in the Master Boot Record

• Con grub-install

grub-install /dev/hda

o meglio... (se si sta installando il sistema)

chroot /mnt/sysimage/

• • con la directory boot sta nella /

/sbin/grub-install --root-directory=/boot /dev/md1

• • con la directory boot è una partizione

/sbin/grub-install --root-directory=/ /dev/md0

• find grub copies:

grub> find /grub/stage1

• or...

grub> find /boot/grub/stage1

• grub (/usr/sbin/grub)

grub> device (hd0) /dev/sdb (/dev/hdb for ide)
grub> root (hd0,0)          (La partizione di boot, Disco 0 Partizione 0)
grub> setup (hd0)           (Installa GRUB nel MBR)
grub> quit                  (Esci dalla shell GRUB)

Immagine sfondo grub

   1. xpm.gz file
   2. 640x480
   3. 14 colors
   4. copiare in /boot/grub
   5. gzip myfile.xpm

VGA modes

| 640x480 800x600 1024x768 1280x1024
----+-------------------------------------
256 | 0x301 0x303 0x305 0x307
32k | 0x310 0x313 0x316 0x319
64k | 0x311 0x314 0x317 0x31A
16M | 0x312 0x315 0x318 0x31B