public String on() {
            return "_";
        }
Generates AsciiDoc files in a special format that can be converted to HTML,
PDF and Unix Man pages.
<p>
This class can be used as a subcommand, in which case it generates man pages
for all non-hidden commands in the hierarchy from the top-level command down,
or it can be executed as a stand-alone tool, in which case the user needs to
specify the {@code @Command}-annotated classes to generate man pages for.
</p>
docs/genadoc.java