Cloning Partition Maps with sfdisk Revision as of Monday, 21 December 2015 at 02:30 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.