Well guys...i've made a big mistake.I've changed accidentally and recursively the permission of the root folder (not /root,but / )After i noticed,i wanted to change it back...and used 666,but i did much more damage than the first time.Isn't there a program that checks all the vital files permissions,or something like that?Since then,all my applications and servers are messed out.What i can do to change it back without reinstalling the OS.