RD cli tool

$ rd list
    Will output all the core classes data retrieving is available for.

$ rd :class_name
    Will output all the class methods and class includes such as additional modules.
    Example:
        $ rd exception
        will output:
            Exception
                methods
                    • ==
                    • backtrace
                    • exception
                    • inspect
                    • message
                    • new
                    • set_backtrace
                    • to_s
        
$ rd :class_name :method
    Will output method interface definition and method description (if available).
    Example:
        $ rd exception to_s
        will output:
            Exception
                method
                    to_s
                interface
                    • exception.to_s   →  string
                description

            Returns exception‘s message (or the name of the exception if no message is set).