http://blog.youkuaiyun.com/taiyang1987912/article/details/41488395
http://www.360doc.com/content/16/0325/23/532901_545276975.shtml
http://www.jb51.net/article/46496.htm
rm -rf *
find /home/nbic/ftp/* | xargs rm -rf
貌似这个删除不了带有空格的文件名的文件