yubikey/pkcs15-tools.md

$ pkcs15-tool --list-certificates 
Using reader with a card: Yubico YubiKey OTP+FIDO+CCID
X.509 Certificate [Certificate for Card Authentication]
	Object Flags   : [0x00]
	Authority      : no
	Path           : 
	ID             : 04
	Encoded serial : 02 09 0088891A87487694BA

$ pkcs15-tool --read-certificate 04

pkcs15-tool --list-public-keys

$ pkcs15-tool --read-ssh-key 01
Using reader with a card: Yubico YubiKey OTP+FIDO+CCID
ecdsa-sha2-nistp384 AAAAE2VjZHNhLXNoYTItbmlzdHAzODQAAAAIbmlzdHAzODQAAABhBEJs6647ldeP1HDTh9d0Aj9kOS2AT/0qUmgQ633iVfAJen27f/Iczw7cfBUWmSR+TnfaQhCkp5PwN2dBb11pYg9La9klnJdJuzC4oiscnOa1vqEWnRoKIN5SKdUPJe29fw== PIV AUTH pubkey

Reference

1. https://ubuntu.com/server/docs/smart-card-authentication