4.3BSD - /usr/man/cat1/tty.0

TTY(1)                                                                  TTY(1)


NAME
       tty - get terminal name

SYNOPSIS
       tty [ -s ]

DESCRIPTION
       Tty  prints  the pathname of the user’s terminal unless the -s (silent)
       is given. In either case, the exit value is zero if the standard  input
       is a terminal and one if it is not.

DIAGNOSTICS
       ‘not a tty’ if the standard input file is not a terminal.


7th Edition                     April 29, 1985                          TTY(1)