文件比较有没有重复？

比较2个txt文件里面的每行数据有没有重复．
如：
1.txt808274                           826542267532
829575                           417850170591
968784                           677512546053
994943                           395284907536
212236                           485276124525
2.txt010653                           641973541583
976885                           972087709626
980109                           759921215816
649015                           043755572655
031179                           843814920390如上所示，首先判断1.txt和2.txt里面的每行数据是否有重复，
然后再判断1.txt和2.txt所有的数据加起来有没有重复？