[root@localhost ~]# lsattr /etc/cron.d/root
---------------- /etc/cron.d/root
[root@localhost ~]# rm -rf /etc/cron.d/root
rm: cannot remove ‘/etc/cron.d/root ’: Permission denied
---------------- /etc/cron.d/root
[root@localhost ~]# rm -rf /etc/cron.d/root
rm: cannot remove ‘/etc/cron.d/root ’: Permission denied