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From: Ron Natalie  
Newsgroups: net.unix
Subject: Re:  Test for background process
Message-ID: <7465@brl-tgr.ARPA>
Date: Thu, 17-Jan-85 11:40:13 EST
Article-I.D.: brl-tgr.7465
Posted: Thu Jan 17 11:40:13 1985
Date-Received: Sun, 20-Jan-85 06:15:15 EST
Sender: news@brl-tgr.ARPA
Organization: Ballistic Research Lab
Lines: 5

Actually, you can't tell any of them.  Isatty only tells you whether
the file descriptor is a terminal or not, which has no correllation
to whether input has been redirected.

-Ron