DEMIGOD
In UNIX the superuser is the only user to have power to perform all priviledged tasks.
Ownership of Files
Ownership of Processes
UID of zero
a.k.a. root
may perform any valid op on a file or process
may execute some system calls
may change ownership credentials at will
login program
should not be easily guessed or discovered
random sequence of letters, punctuation, & digits
case sensitive
only first eight characters are significant
change password too
may login as root
"su" to root
"su username" as root to get to an account
must be in "wheel" group
sudo: A limited su
root is only user with special status
some nonhuman logins for special purposes