V3/man/man8/su.8

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.pa 1
.he 'SU (VIII)'1/20/73'SU (VIII)'
.ti 0
NAME		su  --  become privileged user
.sp
.ti 0
SYNOPSIS	su__
.sp
.ti 0
DESCRIPTION	su
allows one to become the super-user, who has
all sorts of marvelous (and correspondingly dangerous) powers.
In order for su to do its magic, the user must
supply a password.
If the password is correct, su
will execute the shell with the UID set to
that of the super-user.
To restore normal UID privileges,
type an end-of-file to the super-user shell.

To remind the super-user of his responsibilities,
the shell substitutes "#" for its usual prompt "%".
.sp
.ti 0
FILES		--
.sp
.ti 0
SEE ALSO	sh(I)
.sp
.ti 0
DIAGNOSTICS	"Sorry" if password is wrong
.sp
.ti 0
BUGS		--