一般的 /boot/grub/grub.cfg 檔案內容如下：

   1:  #

   2:  # DO NOT EDIT THIS FILE

   3:  #

   4:  # It is automatically generated by /usr/sbin/grub-mkconfig using templates

   5:  # from /etc/grub.d and settings from /etc/default/grub

   6:  #

   7:   

   8:  ### BEGIN /etc/grub.d/00_header ###

   9:  
 
if [ -s $prefix/grubenv ]; then

  10:    load_env

  11:  fi

  12:  set default="4"

  13:  if [ ${prev_saved_entry} ]; then

  14:    set saved_entry=${prev_saved_entry}

  15:    save_env saved_entry

  16:    set prev_saved_entry=

  17:    save_env prev_saved_entry

  18:    set boot_once=true

  19:  fi

  20:   

  21:  function savedefault {

  22:    if [ -z ${boot_once} ]; then

  23:      saved_entry=${chosen}

  24:      save_env saved_entry

  25:    fi

  26:  }

  27:   

  28:  function recordfail {

  29:    set recordfail=1

  30:    if [ -n ${have_grubenv} ]; then if
 
 [ -z ${boot_once} ]; then save_env recordfail; fi; fi

  31:  }

  32:  insmod ext2

  33:  set root='(hd0,9)'

  34:  search --no-floppy --fs-uuid --set d00d6a7c-6b2d-4def-a7f4-394312384d07

  35:  if loadfont /usr/share/grub/unicode.pf2 ; then

  36:    set gfxmode=640x480

  37:    insmod gfxterm

  38:    insmod vbe

  39:    if terminal_output gfxterm ; then true ; else

  40:      # For backward compatibility with versions of terminal.mod that don't

  41:      # understand terminal_output

  42:      terminal gfxterm

  43:    fi

  44:  fi

  45:  insmod ext2

  46:  set root='(hd0,9)'

  47:  search --no-floppy --fs-uuid --set d00d6a7c-6b2d-4def-a7f4-394312384d07

  48:  set locale_dir=($root)/boot/grub/locale

  49:  set lang=zh

  50:  insmod gettext

  51:  if [ ${recordfail} = 1 ]; then

  52:    set timeout=-1

  53:  else

  54:    set timeout=2

  55:  fi

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

  57:   

  58:  ### BEGIN /etc/grub.d/05_debian_theme ###

  59:  set menu_color_normal=white/black

  60:  set menu_color_highlight=black/light-gray

  61:  ### END /etc/grub.d/05_debian_theme ###

  62:   

  63:  ### BEGIN /etc/grub.d/10_linux ###

  64:  menuentry 'Ubuntu，Linux 2.6.32-21-generic' --class ubuntu --class gnu-linux --class gnu --class os {

  65:      recordfail

  66:      insmod ext2

  67:      set root='(hd0,9)'

  68:      search --no-floppy --fs-uuid --set d00d6a7c-6b2d-4def-a7f4-394312384d07

  69:      linux    /boot/vmlinuz-2.6.32-21-generic root=UUID=d00d6a7c-6b2d-4def-a7f4-394312384d07 ro   quiet splash

  70:      initrd    /boot/initrd.img-2.6.32-21-generic

  71:  }

  72:  menuentry 'Ubuntu，Linux 2.6.32-21-generic (恢復模式)' --class ubuntu --class gnu-linux --class gnu --class os {

  73:      recordfail

  74:      insmod ext2

  75:      set root='(hd0,9)'

  76:      search --no-floppy --fs-uuid --set d00d6a7c-6b2d-4def-a7f4-394312384d07

  77:      echo    '載入 Linux ...'

  78:      linux    /boot/vmlinuz-2.6.32-21-generic root=UUID=d00d6a7c-6b2d-4def-a7f4-394312384d07 ro single 

  79:      echo    '載入引導虛擬磁碟 ...'

  80:      initrd    /boot/initrd.img-2.6.32-21-generic

  81:  }

  82:  ### END /etc/grub.d/10_linux ###

  83:   

  84:  ### BEGIN /etc/grub.d/20_memtest86+ ###

  85:  menuentry "Memory test (memtest86+)" {

  86:      insmod ext2

  87:      set root='(hd0,9)'

  88:      search --no-floppy --fs-uuid --set d00d6a7c-6b2d-4def-a7f4-394312384d07

  89:      linux16    /boot/memtest86+.bin

  90:  }

  91:  menuentry "Memory test (memtest86+, serial console 115200)" {

  92:      insmod ext2

  93:      set root='(hd0,9)'

  94:      search --no-floppy --fs-uuid --set d00d6a7c-6b2d-4def-a7f4-394312384d07

  95:      linux16    /boot/memtest86+.bin console=ttyS0,115200n8

  96:  }

  97:  ### END /etc/grub.d/20_memtest86+ ###

  98:   

  99:  ### BEGIN /etc/grub.d/30_os-prober ###

 100:  menuentry "Windows 7 (loader) (on /dev/sda1)" {

 101:      insmod ntfs

 102:      set root='(hd0,1)'

 103:      search --no-floppy --fs-uuid --set ba52ef7d52ef3caf

 104:      chainloader +1

 105:  }

 106:  menuentry "Windows Vista (loader) (on /dev/sda4)" {

 107:      insmod ntfs

 108:      set root='(hd0,4)'

 109:      search --no-floppy --fs-uuid --set 943af8ff3af8dee4

 110:      chainloader +1

 111:  }

 112:  ### END /etc/grub.d/30_os-prober ###

 113:   

 114:  ### BEGIN /etc/grub.d/40_custom ###

 115:  # This file provides an easy way to add custom menu entries.  Simply type the

 116:  # menu entries you want to add after this comment.  Be careful not to change

 117:  # the 'exec tail' line above.

 118:  ### END /etc/grub.d/40_custom ###

修改第12行，使得 set default="X" ，X 的值由預設啟動的系統在程式碼中的序列決定，比方說預設啟動 win7 （程式碼中100行）， win7 在所有列出系統的第 5 位，則 X = 4，則 set default=”4” 即可。

---EOF---

插入程式碼時候沒有 shell 指令碼選項，我選擇的是 MSH，顯示效果很好，不是嗎？