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grub.cfg file 

#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by /usr/sbin/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
  load_env
fi
set default="0"
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 ${boot_once} ]; then save_env recordfail; fi; fi
}
insmod ext2
set root='(hd0,2)'
search --no-floppy --fs-uuid --set fd0dc699-583e-41f1-87c3-410adb6cd73c
if loadfont /usr/share/grub/unicode.pf2 ; then
  set gfxmode=640x480
  insmod gfxterm
  insmod vbe
  if terminal_output gfxterm ; then true ; else
    # For backward compatibility with versions of terminal.mod that don't
    # understand terminal_output
    terminal gfxterm
  fi
fi
insmod ext2
set root='(hd0,2)'
search --no-floppy --fs-uuid --set fd0dc699-583e-41f1-87c3-410adb6cd73c
set locale_dir=($root)/boot/grub/locale
set lang=en
insmod gettext
if [ ${recordfail} = 1 ]; then
  set timeout=-1
else
  set timeout=10
fi
### 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
### END /etc/grub.d/05_debian_theme ###

### BEGIN /etc/grub.d/06_mint_theme ###
insmod ext2
set root='(hd0,2)'
search --no-floppy --fs-uuid --set fd0dc699-583e-41f1-87c3-410adb6cd73c
insmod png
if background_image /boot/grub/linuxmint.png ; then
  set color_normal=white/black
  set color_highlight=white/light-gray
else
  set menu_color_normal=white/black
  set menu_color_highlight=white/light-gray
fi
### END /etc/grub.d/06_mint_theme ###

### BEGIN /etc/grub.d/10_linux ###
menuentry "Linux Mint 9, 2.6.32-21-generic (/dev/sda2)" --class linuxmint --class gnu-linux --class gnu --class os {
	recordfail
	insmod ext2
	set root='(hd0,2)'
	search --no-floppy --fs-uuid --set fd0dc699-583e-41f1-87c3-410adb6cd73c
	linux	/boot/vmlinuz-2.6.32-21-generic root=UUID=fd0dc699-583e-41f1-87c3-410adb6cd73c ro  splash  quiet splash
	initrd	/boot/initrd.img-2.6.32-21-generic
}
menuentry "Linux Mint 9, 2.6.32-21-generic (/dev/sda2) -- recovery mode" --class linuxmint --class gnu-linux --class gnu --class os {
	recordfail
	insmod ext2
	set root='(hd0,2)'
	search --no-floppy --fs-uuid --set fd0dc699-583e-41f1-87c3-410adb6cd73c
	echo	'Loading Linux 2.6.32-21-generic ...'
	linux	/boot/vmlinuz-2.6.32-21-generic root=UUID=fd0dc699-583e-41f1-87c3-410adb6cd73c ro single  splash
	echo	'Loading initial ramdisk ...'
	initrd	/boot/initrd.img-2.6.32-21-generic
}
### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/10_lupin ###
### END /etc/grub.d/10_lupin ###

### BEGIN /etc/grub.d/20_memtest86+ ###
menuentry "Memory test (memtest86+)" {
	insmod ext2
	set root='(hd0,2)'
	search --no-floppy --fs-uuid --set fd0dc699-583e-41f1-87c3-410adb6cd73c
	linux16	/boot/memtest86+.bin
}
menuentry "Memory test (memtest86+, serial console 115200)" {
	insmod ext2
	set root='(hd0,2)'
	search --no-floppy --fs-uuid --set fd0dc699-583e-41f1-87c3-410adb6cd73c
	linux16	/boot/memtest86+.bin console=ttyS0,115200n8
}
### END /etc/grub.d/20_memtest86+ ###

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

custom.cfg file 

# custom menu entries read at grub boot. (no need to run sudo update-grub if using)

# Sample entry to boot other Grub from otheros  
#menuentry "Load other grub.cfg" { 
	search --set=root --fs-uuid UUID_HERE; configfile /boot/grub/grub.cfg 
}

# Linux Mint 12 Grub File
menuentry "Mint 12" { 
	insmod ext2
	set root='(hd0,3)'
	search --set=root --fs-uuid 882c0c70-13a8-4127-8105-05ab29cddc64; configfile /boot/grub/grub.cfg 
}

# Pinguy OS Grub File
menuentry "Pinguy OS" { 
	search --set=root --fs-uuid 92c9cfaf-6727-4303-b8b8-d03f1e07dd2e; configfile /boot/grub/grub.cfg 
}

# Linux Mint Debian Edition Grub file
menuentry "Linux Mint Debian" { 
	search --set=root --fs-uuid 5f43986b-a231-4504-992a-29b2a46621e6; configfile /boot/grub/grub.cfg 
}

41_custom file 

#!/bin/sh
cat <<EOF
if [ -f  \$prefix/custom.cfg ]; then
  source \$prefix/custom.cfg;
fi
EOF