V3/usr/man/man8/su.8

Find at most related files.
including files from this version of Unix. 
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NAME		su  --  become privileged user
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SYNOPSIS	su__
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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 "%".
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FILES		--
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SEE ALSO	sh(I)
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DIAGNOSTICS	"Sorry" if password is wrong
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BUGS		--