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From: ron@BRL-TGR.ARPA
Newsgroups: net.unix
Subject: Re:  Why 4BSD 'stty' uses stdout instead of stdin
Message-ID: <12450@sri-arpa.UUCP>
Date: Tue, 14-Aug-84 11:04:12 EDT
Article-I.D.: sri-arpa.12450
Posted: Tue Aug 14 11:04:12 1984
Date-Received: Thu, 16-Aug-84 02:21:05 EDT
Lines: 8

From:      Ron Natalie 

Actually, people more jealously guard their TTY's read permission
than their write permissions.  In mundane UNIX systems all kinds of
things expect to be able to write on other user's terminals, but allowing
reads/sttys is a real hassle/security violation.

-Ron