flush

# File lib/webrick/httpauth/htgroup.rb, line 64
      def flush(output=nil)
        output ||= @path
        tmp = Tempfile.create("htgroup", File::dirname(output))
        begin
          @group.keys.sort.each{|group|
            tmp.puts(format("%s: %s", group, self.members(group).join(" ")))
          }
        ensure
          tmp.close
          if $!
            File.unlink(tmp.path)
          else
            return File.rename(tmp.path, output)
          end
        end
      end