dnssec-importkey: invalid argument --
Usage:
    dnssec-importkey options [-K dir] keyfile

    dnssec-importkey options -f file [keyname]

Version: 9.20.30
Options:
    -f file: read key from zone file
    -K <directory>: directory in which to store the key files
    -L ttl:             set default key TTL
    -v <verbose level>
    -V: print version information
    -h: print usage and exit
Timing options:
    -P date/[+-]offset/none: set/unset key publication date
    -P sync date/[+-]offset/none: set/unset CDS and CDNSKEY publication date
    -D date/[+-]offset/none: set/unset key deletion date
    -D sync date/[+-]offset/none: set/unset CDS and CDNSKEY deletion date