A question of merging many small minted ZEC to one address

There were many small minted ZEC, I want to merge them to one address. How could I do?
I just saw on https://explorer.testnet.z.cash/, there was somebody already did so. Which command line should I do?

This process to send coins is explained in the Zcash public alpha guide :

Right now it is a manual process, I believe it will be a more automatic process by 1.0 Launch.