For every one character option there is also a long option, which is listed right next to the "short"
option name:
-v, --version
Displays the version of radvdump and then aborts.
-h, --help
Displays a short usage description and then aborts.
-f, --file-format
Output received router advertisements in the format of the radvd configuration file. Since radvd
0.9, this is the default and the switch is provided for backward compatibility only.
-e, --exclude-defaults
Exclude default valued options from configuration file format. This option is ignored if option
-f is not set.
-d debuglevel, --debug debuglevel
With this option you turn on debugging information. The debugging level is an integer in the range
from 1 to 4, from quiet to very verbose. A debugging level of 0 completely turns off debugging.
The default debugging level is 0.