I used chmod 4755 for a directory. Then, when I executed "ls", it showed drwsr-xr-x. I, however, reset its permission to 0755 and it kept showing drwsr-xr-x. I do not think "s" affects anything, but it is really weird. How can I get rid of "s"? Or shouldn't I care about it?
My OS is Ubuntu 14.04.