dnssec-revoke: invalid argument --
Usage:
    dnssec-revoke [options] keyfile

Version: 9.20.30
    -E engine:    specify OpenSSL engine
    -f:           force overwrite
    -h:           help
    -K directory: use directory for key files
    -r:           remove old keyfiles after creating revoked version
    -v level:     set level of verbosity
    -V:           print version information
Output:
     K<name>+<alg>+<new id>.key, K<name>+<alg>+<new id>.private