V8/usr/man/man8/su.8

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.TH SU 8 
.SH NAME
su \- substitute user id temporarily
.SH SYNOPSIS
.B /etc/su
[ user ]
.SH DESCRIPTION
.I Su
demands the password for the login name
.I user,
and if it is given,
changes to that userid
and invokes the Shell
.IR sh (1)
without changing the current directory.
The user environment
is unchanged except for HOME and SHELL,
which are taken from the password file
for the user being substituted
(see
.IR environ (5)).
The new userid stays in force until the Shell exits.
.PP
If no 
.I user
is specified, `root' is assumed.
To remind the super-user of his responsibilities,
the Shell substitutes `#' for its usual prompt.
.SH "SEE ALSO"
sh(1)