TTY(1) UNIX Programmer's Manual TTY(1)
S
\bSY
\bYN
\bNO
\bOP
\bPS
\bSI
\bIS
\bS
D
\bDE
\bES
\bSC
\bCR
\bRI
\bIP
\bPT
\bTI
\bIO
\bON
\bN
_
\bT_
\bt_
\by 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.
D
\bDI
\bIA
\bAG
\bGN
\bNO
\bOS
\bST
\bTI
\bIC
\bCS
\bS
`not a tty' if the standard input file is not a terminal.
Printed 7/9/88 April 29, 1985 1