unknown option -- -
usage: ssh-add [-CcDdKkLlqvXx] [-E fingerprint_hash] [-H hostkey_file]
               [-h destination_constraint] [-S provider] [-t life]
               [file ...]
       ssh-add -s pkcs11 [-Cv] [certificate ...]
       ssh-add -e pkcs11
       ssh-add -T pubkey ...