def execute(command, params={})
      unless params[:dry_run]
        if params[:return]
          System.execute(command, :return => true)
        else
          $stdout.puts
          System.execute(command)
        end
      end
    end
def execute(command, params={})
      unless params[:dry_run]
        if params[:return]
          System.execute(command, :return => true)
        else
          $stdout.puts
          System.execute(command)
        end
      end
    end
execute the command, or not, and return the results, or not