Code: ~livecd/usb-build.sh

#!/bin/bash
LIVECD=~/livecd
TARGET=${LIVECD}/target
TARGET_SOURCE=${TARGET}/files/source/
SOURCE=${LIVECD}/source

#USB settings
USBDEV=/dev/sda
MNTDIR=/mnt/usbstick

#USB
echo "Warning!!! You are about to reformat your usb device on ${USBDEV}!!!"
echo "The following partitions will be overwritten:"
sfdisk -l ${USBDEV}
echo "Are you certain that this is what you intend?"
echo "Press enter to continue or CTRL-C to quit."
read user_reply
echo "Please wait, preparing usb device . . ."
dd if=/dev/zero of=${USBDEV}
sfdisk -q ${USBDEV} << EOF
0,,L,*
;
;
;
EOF
mke2fs -m0 ${USBDEV}1
mkdir ${MNTDIR}
mount ${USBDEV}1 ${MNTDIR}

echo "Copying files to USB device . . ."
cp -p -R -P -d ${TARGET}/* ${MNTDIR}

echo "Modifying ${MNTDEV}/boot/grub/menu.lst . . ."
sed 's/(cd)/(hd0,0)/g' ${MNTDIR}/boot/grub/menu.lst > ${MNTDIR}/boot/grub/menu.lst-tmp && mv ${MNTDIR}/boot/grub/menu.lst-tmp ${MNTDIR}/boot/grub/menu.lst
# This may need to be changed to replace the cdroot with something better, like usbroot?
#sed 's/cdroot//g' ${MNTDIR}/boot/grub/menu.lst > ${MNTDIR}/boot/grub/menu.lst-tmp && mv ${MNTDIR}/boot/grub/menu.lst-tmp ${MNTDIR}/boot/grub/menu.lst
echo "Installing Grub . . ."
grub-install --root-directory=${MNTDIR} ${USBDEV} --recheck

echo "Unmounting ${MNTDIR} . . ."
umount ${MNTDIR}

echo "Your bootable USB drive should be complete."