usage: radvd
  -C, --config=PATH       Set the config file.  Default is /etc/radvd.d.
  -c, --configtest        Parse the config file and exit.
  -d, --debug=NUM         Set the debug level.  Values can be 1, 2, 3, 4 or 5.
  -f, --facility=NUM      Set the logging facility.
  -h, --help              Show this help screen.
  -l, --logfile=PATH      Set the log file.
  -m, --logmethod=X       Set method to: syslog, stderr, stderr_syslog, logfile,
                          stderr_clean, or none.
  -n, --nodaemon          Prevent the daemonizing.
  -p, --pidfile=PATH      Set the pid file.
  -t, --chrootdir=PATH    Chroot to the specified path.
  -u, --username=USER     Switch to the specified user.
  -v, --version           Print the version and quit.