Cloning Partition Maps with sfdisk Revision as of Sunday, 20 December 2015 at 19:56 UTC
This is so elegant, it makes me want to hug a penguin.
 sfdisk -d /dev/hda | sfdisk /dev/hdb
This will clone the partition map from /dev/hda to /dev/hdb. I
usually use fdisk (or parted) to clear all partitions first.