# File lib/gettext/tools/msgcat.rb, line 41
      def run(*command_line)
        config = Config.new
        config.parse(command_line)

        parser = POParser.new
        parser.report_warning = config.report_warning?
        parser.ignore_fuzzy = !config.include_fuzzy?
        output_po = PO.new
        output_po.order = config.order
        merger = Merger.new(output_po, config)
        config.pos.each do |po_file_name|
          po = PO.new
          parser.parse_file(po_file_name, po)
          merger.merge(po)
        end

        output_po_string = output_po.to_s(config.po_format_options)
        if config.output.is_a?(String)
          File.open(File.expand_path(config.output), "w") do |file|
            file.print(output_po_string)
          end
        else
          puts(output_po_string)
        end
      end