dumpkeys [ -hilfn -ccharset --help --short-info --long-info --numeric --full-table --funcs-only --keys-only --compose-only --charset=charset ]
dumpkeys writes, to the standard output, the current contents of the keyboard driver's translation tables, in the format specified by keymaps(5).
Using the various options, the format of the output can be controlled and also other information from the kernel and the programs dumpkeys(1) and loadkeys(1) can be obtained.
Number of actions bindable to a key
Ranges of action codes supported by the kernel
(see keymaps(5) for more information about the format of key definition lines). dumpkeys(1) and loadkeys(1) support a symbolic notation, which is preferable to the numeric one, as the action codes may vary from kernel to kernel while the symbolic names usually remain the same. However, the list of action code ranges can be used to determine, if the kernel actually supports all the symbols loadkeys(1) knows, or are there maybe some actions supported by the kernel that have no symbolic name in your loadkeys(1) program. To see this, you compare the range list with the action symbol list, see option --long-info below.
Number of function keys supported by kernel