su \*- become privileged user
allows one to become the super-user, who has
all sorts of marvelous (and correspondingly dangerous) powers.
In order for \fIsu\fR to do its magic, the user must
If the password is correct, \fIsu\fR
will execute the Shell with the UID set to
To restore normal UID privileges,
type an end-of-file to the super-user Shell.
The password demanded is that of the entry ``root''
in the system's password file.
To remind the super-user of his responsibilities,
the Shell substitutes `#' for its usual prompt `%'.