config root man

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.\"	@(#)tty.1	8.1 (Berkeley) 6/6/93
.\" $FreeBSD: release/9.1.0/usr.bin/tty/tty.1 216370 2010-12-11 08:32:16Z joel $
.\"
.Dd June 6, 1993
.Dt TTY 1
.Os
.Sh NAME
.Nm tty
.Nd return user's terminal name
.Sh SYNOPSIS
.Nm
.Op Fl s
.Sh DESCRIPTION
The
.Nm
utility writes the name of the terminal attached to standard input
to standard output.
The name that is written is the string returned by
.Xr ttyname 3 .
If the standard input is not a terminal, the message
.Dq Li "not a tty"
is written.
The options are as follows:
.Bl -tag -width indent
.It Fl s
Do not write the terminal name; only the exit status is affected
when this option is specified.
The
.Fl s
option is deprecated in favor of the
.Dq Li "test -t 0"
command.
.El
.Sh EXIT STATUS
The
.Nm
utility
exits 0 if the standard input is a terminal, 1 if the standard input is
not a terminal, and >1 if an error occurs.
.Sh SEE ALSO
.Xr test 1 ,
.Xr ttyname 3
.Sh STANDARDS
The
.Nm
utility is expected to be
.St -p1003.2
compatible.
.Sh HISTORY
A
.Nm
command appeared in
.At v1 .