def add_input_option(option_name, *args)
      (@input_options ||= []).push(option_name)
      args.each { |ea| @input_options.push(Shellwords.escape(ea.to_s)) }

      # Support call chaining:
      self
    end
def add_input_option(option_name, *args)
      (@input_options ||= []).push(option_name)
      args.each { |ea| @input_options.push(Shellwords.escape(ea.to_s)) }

      # Support call chaining:
      self
    end
If you need to add an option that affects processing of input files,
 you can use this method.