TTY(1) — Unix Programmer’s Manual
NAME
tty − get terminal name
SYNOPSIS
tty [ option ]
DESCRIPTION
Tty prints the pathname of the user’s terminal unless the −s (silent) is given. In either case, the exit value is 0 if the standard input is a terminal and 1 if it is not.
OPTIONS
−s Suppresses the printing of the pathname ("silent" mode, no output).
DIAGNOSTICS
The message ‘not a tty’ means the standard input file is not a terminal.
INTEGRATED SOLUTIONS 4.3 BSD — April 29, 1985