I have to dump all my GPT partitions from one drive to another.
The MBR equivalent would be
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Take a look at GPT fdisk:
[I] sys-apps/gptfdisk Available versions: 0.6.13 (~)0.7.2 (~)0.8.0 Installed versions: 0.8.0(10:58:25 PM 10/12/2011) Homepage: http://www.rodsbooks.com/gdisk/ Description: gdisk - GPT partition table manipulator for Linux
Assuming that you want to dump partition table from
sdb, try this:
sgdisk -R=/dev/sdb /dev/sda
Pay attention to the order, don't revert.