.\" Copyright (c) 1990 The Regents of the University of California.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" the Institute of Electrical and Electronics Engineers, Inc.
.\"
.\" %sccs.include.redist.roff%
.\"
.\"	@(#)tty.1	6.5 (Berkeley) 07/30/91
.\"
.Dd 
.Dt TTY 1
.Os
.Sh NAME
.Nm tty
.Nd return user's terminal name
.Sh SYNOPSIS
.Nm tty
.Op Fl s
.Sh DESCRIPTION
The
.Nm tty
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 ``not a tty''
is written.
The options are as follows:
.Bl -tag -width Ds
.It Fl s
Don't 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
.Pp
.Nm Tty
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 tty
function is expected to be
.St -p1003.2
compatible.