If you’re new to Linux administration, you’ve probably already started learning about file permissions. If I said “drwxrwxr-x,” you’d know what that meant. It’s simple: A directory with owner and group read, write, execute permissions, but only read and execute permissions for everyone else. . That’s not the be-all, end all for permissions.
Link: Linux 101: What is the SUID permission?
via http://www.techrepublic.com
