General options:
‒‒‒‒‒‒‒‒‒‒‒‒‒‒‒‒

--help

Show an overview of all options of the "rak" command line interface.

--help=subject

Show additional information about the given subject.  Possible subjects
are (in alphabetical order)

- argument    Argument format
- code        Code pattern helpers
- content     Content modifiers
- debugging   Debugging options
- examples    Usage examples
- faq         Frequently asked questions
- filesystem  File system filters
- general     General options
- haystack    Haystack specification
- item        Item producers
- listing     Listing modifiers
- option      Option management
- pattern     Pattern specification
- philosophy  Ruminations
- resource    Resource usage
- result      Result modifiers
- special     Special options
- string      String search pattern modifiers

--help foo

Show information about "foo" in all help subjects, and show the entire
logical paragraph of any match.

--help=faq foo

Show information about "foo" in the given subject only, and show the
entire logical paragraph of any match.

--progress

Show progress of searching as "nr-files / nr-lines / nr-matches" on
STDERR, updated 5 times per second

--version

Show version information about the "rak" command line interface.

--verbose

Show more information if possible, depending on the other arguments.
