/etc/init.d 目录无法写文件

CP156:/ # ll | grep etc
drwxr-xr-x 95 root root 8192 Jun 13 19:51 etc

CP156:/etc # ll | grep init.d
drwxr-xr-x 11 root root 4096 Dec 14 14:00 init.d
lrwxrwxrwx 1 root root 6 Oct 19 2010 rc.d -> init.d

CP156:/etc/init.d # touch aaa
touch: cannot touch `aaa': Permission denied

检查了root权限也没有发现神马问题,比较了另一台机器,权限一样,另一台可以touch成功;
求达人解惑!