Usage:
    dnssec-cds options [options] -f <file> -d <path> <domain>
Version: 9.20.30
Options:
    -a <algorithm>     digest algorithm (SHA-1 / SHA-256 / SHA-384)
    -c <class>         of domain (default IN)
    -D                 prefer CDNSKEY records instead of CDS
    -d <file|dir>      where to find parent dsset- file
    -f <file>          child DNSKEY+CDNSKEY+CDS+RRSIG records
    -i[extension]      update dsset- file in place
    -s <start-time>    oldest permitted child signatures
    -u                 emit nsupdate script
    -T <ttl>           TTL of DS records
    -V                 print version
    -v <verbosity>