Create a bootable USB stick on OS X

create_bootable_usb.sh

# Convert .iso to .img. OS X will create a ".img.dmg", don't rename it
hdiutil convert -format UDRW -o ~/path/to/target.img ~/path/to/os.iso

# Remove your USB device and run
diskutil list

# Insert USB device and run diskutil again
diskutil list

# Determine the device node assigned to your flash media (e.g. /dev/disk2)
# and unmount your USB device. Replace "diskN" with the disk number from
# your last command
diskutil unmountDisk /dev/diskN

# Convert and copy the file to your USB device
sudo dd if=/path/to/downloaded.img of=/dev/rdiskN bs=1m

# - Using /dev/rdisk instead of /dev/disk may be faster
# - If you see the error dd: Invalid number '1m', you are using GNU dd. Use the
#   same command but replace bs=1m with bs=1M
# - If you see the error dd: /dev/diskN: Resource busy, make sure the disk is not in use. Start the 'Disk Utility.app' and unmount (don't eject) the drive

# Remove your USB device, when command is complete
diskutil eject /dev/diskN