Linux下删除某个目录时，提示Operation not permitted

[root@izwz91quxhnlkan8kjak5hz wwwroot]# ls
default  www.syshop.com
[root@izwz91quxhnlkan8kjak5hz wwwroot]# rm -rf www.syshop.com/
rm: cannot remove ‘www.syshop.com/.user.ini’: Operation not permitted
[root@izwz91quxhnlkan8kjak5hz www.syshop.com]# lsattr .user.ini 
----i--------e-- .user.ini
[root@izwz91quxhnlkan8kjak5hz www.syshop.com]# chattr -i .user.ini 
[root@izwz91quxhnlkan8kjak5hz www.syshop.com]# rm -rf .user.ini 
[root@izwz91quxhnlkan8kjak5hz wwwroot]# rm -rf www.syshop.com/