Create a bootable USB stick from an ISO image on OSX, command line alternative to Unetbootin

isocopy.sh

#!/usr/bin/env bash
if [ -z $2 ]; then
    echo "Create a bootable USB stick from an ISO image."
    echo
    echo "Usage: $0 <iso> <disk>"
    echo
    echo "Target disks:"
    diskutil list | grep '^/dev' | grep 'external' | sed -e 's/disk/rdisk/' -e 's/:$//' -e 's/^/  /'
    exit 1
fi

if [ ! `which pv` ]; then
    echo "Error: pv not installed"
    echo "Install using 'brew install pv'"
    exit 1
fi

sudo ls > /dev/null

ISO=$1
DISK=$2
IMAGE=${ISO%.*}.img.dmg

echo "Converting ISO to IMG..."
[ -f $IMAGE ] && mv $IMAGE $IMAGE.bk
hdiutil convert -format UDRW -o $IMAGE $ISO > /dev/null

echo "Erasing target disk..."
diskutil partitionDisk $DISK 1 "Free Space" "unused" "100%" > /dev/null

echo "Copying..."
SIZE=`stat -f%z $IMAGE`
sudo dd if=$IMAGE | pv -s $SIZE | sudo dd of=$DISK bs=1m

echo "Ejecting..."
diskutil eject $DISK > /dev/null

echo "Done.