cat file.gpg | gpg --with-colons --import-options show-only --import
gpg --fingerprint
gpg --batch --list-packets file.gpg
gpg --list-keys
gpg --decrypt file.json.gpg
gpg --openpgp -e file.json
gpg --export KEY_ID > my-pubkey
gpg --export-secret-keys KEY_ID > my-prv