--list-secret-keys
-K
    List all keys from the secret keyrings, or just the ones given on the command line. A # after the letters sec means that the secret key is not usable (for example, if it was created via --export-secret-subkeys).

                          _     ___   ___     __               _  _ __  
        _ __   __ _ _   _| | __/ _ \ ( _ )   / /_   _____ _ __| || |\ \ 
       | '_ \ / _` | | | | |/ / | | |/ _ \  | |\ \ / / _ \ '__| || |_| |
       | | | | (_| | |_| |   <| |_| | (_) | | | \ V /  __/ |  |__   _| |
       |_| |_|\__, |\__,_|_|\_\\___/ \___/  | |  \_/ \___|_|     |_| | |
              |___/                          \_\                    /_/