Membedah isi dari grub.cfg di ubuntu

#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
  set have_grubenv=true
  load_env
fi
set default="0"

Script diatas digunakan untuk urutan booting dengan ubuntu sebagai urutan pertama, jika ingin windows anda urutan pertama di tampilan grub maka rubahlah angka "0" menjadu "5" karena posisi windows berada di urutan ke "5" (lihat gambar).

 

if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi

function savedefault {
  if [ -z "${boot_once}" ]; then
    saved_entry="${chosen}"
    save_env saved_entry
  fi
}

function recordfail {
  set recordfail=1
  if [ -n "${have_grubenv}" ]; then if [ -z "${boot_once}" ]; then save_env recordfail; fi; fi
}

function load_video {
  insmod vbe
  insmod vga
  insmod video_bochs
  insmod video_cirrus
}

insmod part_msdos
insmod ext2
set root='(hd0,msdos2)'
search --no-floppy --fs-uuid --set=root 3f0beda7-2a73-4b55-8e7a-2f8802aba845
if loadfont /usr/share/grub/unicode.pf2 ; then
  set gfxmode=auto
  load_video
  insmod gfxterm
  insmod part_msdos
  insmod ext2
  set root='(hd0,msdos2)'
  search --no-floppy --fs-uuid --set=root 3f0beda7-2a73-4b55-8e7a-2f8802aba845
  set locale_dir=($root)/boot/grub/locale
  set lang=en_US
  insmod gettext
fi
terminal_output gfxterm
if [ "${recordfail}" = 1 ]; then
  set timeout=-1
else
  set timeout=10
fi

Script diatas merupakan script untuk menghitung mundur dari 10-0 di grub jika kursor tidak digerakkan. Kita bisa menghilangkan waktunya dengan mengganti angka 10 menjadi 0.

### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/05_debian_theme ###
set menu_color_normal=white/black
set menu_color_highlight=black/light-gray
if background_color 44,0,30; then
  clear
fi
### END /etc/grub.d/05_debian_theme ###

Script diatas digunakan untuk menentukan warna pada grub yang masih default. Jika ingin merubah warnanya tinggal rubah saja.### END /etc/grub.d/05_debian_theme ###, digunakan untuk mengganti gambar.

### BEGIN /etc/grub.d/10_linux ###
if [ ${recordfail} != 1 ]; then
  if [ -e ${prefix}/gfxblacklist.txt ]; then
    if hwmatch ${prefix}/gfxblacklist.txt 3; then
      if [ ${match} = 0 ]; then
        set linux_gfx_mode=keep
      else
        set linux_gfx_mode=text
      fi
    else
      set linux_gfx_mode=text
    fi
  else
    set linux_gfx_mode=keep
  fi
else
  set linux_gfx_mode=text
fi
export linux_gfx_mode
if [ "$linux_gfx_mode" != "text" ]; then load_video; fi
menuentry 'Ubuntu, with Linux 3.0.0-12-generic' --class ubuntu --class gnu-linux --class gnu --class os {
      recordfail
      set gfxpayload=$linux_gfx_mode
      insmod gzio
      insmod part_msdos
      insmod ext2
      set root='(hd0,msdos2)'
      search --no-floppy --fs-uuid --set=root 3f0beda7-2a73-4b55-8e7a-2f8802aba845
      linux /boot/vmlinuz-3.0.0-12-generic root=UUID=3f0beda7-2a73-4b55-8e7a-2f8802aba845 ro   quiet splash vt.handoff=7
      initrd      /boot/initrd.img-3.0.0-12-generic
}
menuentry 'Ubuntu, with Linux 3.0.0-12-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os {
      recordfail
      insmod gzio
      insmod part_msdos
      insmod ext2
      set root='(hd0,msdos2)'
      search --no-floppy --fs-uuid --set=root 3f0beda7-2a73-4b55-8e7a-2f8802aba845
      echo  'Loading Linux 3.0.0-12-generic ...'
      linux /boot/vmlinuz-3.0.0-12-generic root=UUID=3f0beda7-2a73-4b55-8e7a-2f8802aba845 ro recovery nomodeset
      echo  'Loading initial ramdisk ...'
      initrd      /boot/initrd.img-3.0.0-12-generic
}
### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/20_memtest86+ ###
menuentry "Memory test (memtest86+)" {
      insmod part_msdos
      insmod ext2
      set root='(hd0,msdos2)'
      search --no-floppy --fs-uuid --set=root 3f0beda7-2a73-4b55-8e7a-2f8802aba845
      linux16     /boot/memtest86+.bin
}
menuentry "Memory test (memtest86+, serial console 115200)" {
      insmod part_msdos
      insmod ext2
      set root='(hd0,msdos2)'
      search --no-floppy --fs-uuid --set=root 3f0beda7-2a73-4b55-8e7a-2f8802aba845
      linux16     /boot/memtest86+.bin console=ttyS0,115200n8
}
### END /etc/grub.d/20_memtest86+ ###

### BEGIN /etc/grub.d/30_os-prober ###
menuentry "Microsoft Windows XP Professional (on /dev/sda1)" --class windows --class os {
      insmod part_msdos
      insmod ntfs
      set root='(hd0,msdos1)'
      search --no-floppy --fs-uuid --set=root 5A80544E8054332D
      drivemap -s (hd0) ${root}
      chainloader +1
}
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f  $prefix/custom.cfg ]; then
  source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###

Script diatas merupakan isi dari menu-menu boot di grub. Jika ingin menonaktifkan salah satu menunya naka gunakan tanda #.

Terima kasih
Terinspirasi oleh: http://www.kaskus.us/showthread.php?t=11302713