In Clon, there are different kinds of options: in addition to having
a short and/or long name, an option may or may not take an argument. For
those taking one, the argument may be either mandatory or optional.
Then, there is also an additional, extended call syntax for some of
them. But then again, that is not the whole story about getting an
option’s value (see Option Retrieval). If everything goes well, you
are now wondering whether you really want to use a command-line at all.