看了很多文章，基本推荐的都是 fdupes
查找后但是没有人告诉你怎么删除啊。。。
files marked for preservation, for deletion
国内的教程基本都是复制的，结果有用的文章很少。
确认删除执行的的命令是 prune
prune look through entire cache and delete orphaned entries
( Preserve files [1 - 2, all, help] )= prune
1 files marked for preservation, 1 for deletion
