For example, I was reading
setuid man page today. It says:
If the effective UID of the caller is root, the real UID and saved set-user-ID are also set.
I don't know what
set-user-ID is. How can I get more information about it if I don't have Internet connection?
One thing I can do is to open some books and search for it.
What are other places on my Linux system where I can search for more information?