I was wondering what the letter T means on the following results.

$ ls -l /dev/mem
crw-r----T 1 root kmem 1, 1 Jan  1  1970 /dev/mem

I have changed the permissions and now I don't know how restore that letter T.


Finally i figure out thanks to @SteveRobillard link.

To restore to original priviliges:

sudo chmod 640 /dev/mem
sudo chmod +t /dev/mem

Smething with t permission is something that can only be moved or deleted by that object's owner, the directory owner, or the super-user.

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