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If your program processes its arguments in named option mode (See
long-opts in Program Description Attributes), then you may select
one of your options to be the default option. Do so by using
attribute default with one of the options. The option so specified
must have an arg-type (see Option Argument Specification) specified, but not the
arg-optional (see Option Argument Optional) attribute. That is to say, the
option argument must be required.
If you have done this, then any arguments that do not match an option name and
do not contain an equal sign (=) will be interpreted as an option
argument to the default option.