card-cli

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GPG private keys can be copied or moved to the Yubikey. The following examples moves them.

❯ gpg --edit-key <keyId>

gpg> toggle
gpg> key 1
gpg> keytocard

Please select where to store the key:
   (1) Signature key
   (3) Authentication key
Your selection? 1

gpg> key 1
gpg> key 2
gpg> keytocard

Please select where to store the key:
   (2) Encryption key
Your selection? 2

gpg> key 2
gpg> key 3
gpg> keytocard

Please select where to store the key:
   (3) Authentication key
Your selection? 3

gpg> quit

https://ruimarinho.gitbooks.io/yubikey-handbook/content/openpgp/importing-keys.html