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Path: utzoo!watmath!clyde!burl!ulysses!allegra!mit-eddie!think!harvard!seismo!cmcl2!phri!pluto!warren
From: warren@pluto.UUCP (Warren Burstein)
Newsgroups: net.bugs
Subject: "who am i" from a ptty
Message-ID: <191@pluto.UUCP>
Date: Wed, 20-Nov-85 22:58:06 EST
Article-I.D.: pluto.191
Posted: Wed Nov 20 22:58:06 1985
Date-Received: Sun, 24-Nov-85 07:07:01 EST
Organization: Industrial Automation Systems Inc., New York, N.Y.
Lines: 6

I just discovered that "who am i" prints nothing if stdin is a ptty.
It gets the name from ttyname, then searches /etc/utmp for a line
matching the ptty.  Since no one is logged in on a ptty it fails.

This was observed under Pyramid OS-X which pretends to be both BSD and
SysV.