Telling whether the user is at the console

[Conor P. Cahill]

In article <1990Oct1.204707.21038 at elroy.jpl.nasa.gov> pjs at aristotle.jpl.nasa.gov writes:
>What's the easiest way to tell from (1) a shell script; (2) a C
>program, whether the user process that called either of them was
>logged in at the console?  I've looked at /etc/utmp, but it seems

1. tty(1)
2. ttyname(3)

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Conor P. Cahill            (703)430-9247        Virtual Technologies, Inc.,
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