/usr/bin/nsd: invalid option -- '-'
Usage: nsd [OPTION]...
Name Server Daemon.

Supported options:
  -4                   Only listen to IPv4 connections.
  -6                   Only listen to IPv6 connections.
  -a ip-address[@port] Listen to the specified incoming IP address (and port)
                       (May be specified multiple times).
  -c configfile        Read specified configfile instead of /etc/nsd/nsd.conf.
  -d                   do not fork as a daemon process.
  -h                   Print this help information.
  -i identity          Specify the identity when queried for id.server CHAOS TXT.
  -I nsid              Specify the NSID. This must be a hex string.
  -l filename          Specify the log file.
  -N server-count      The number of servers to start.
  -n tcp-count         The maximum number of TCP connections per server.
  -P pidfile           Specify the PID file to write.
  -p port              Specify the port to listen to.
  -s seconds           Dump statistics every SECONDS seconds.
  -t chrootdir         Change root to specified directory on startup.
  -u user              Change effective uid to the specified user.
  -V level             Specify verbosity level.
  -v                   Print version information.
Version 4.15.4. Report bugs to <https://github.com/NLnetLabs/nsd/issues or nsd-bugs@nlnetlabs.nl>.