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From: hartley@uvm-cs.UUCP (Stephen J. Hartley)
Newsgroups: net.unix-wizards
Subject: 4.2 kill init question
Message-ID: <346@uvm-cs.UUCP>
Date: Wed, 30-Jan-85 18:31:08 EST
Article-I.D.: uvm-cs.346
Posted: Wed Jan 30 18:31:08 1985
Date-Received: Sat, 2-Feb-85 14:39:35 EST
Organization: University of Vermont
Lines: 36

Our dial-in modems hang occasionally when users run background jobs without
redirecting stdin, stdout, and stderr.  We are running 4.2 BSD.  I got tired
of unhanging them by hand so I wrote the following shell script to do exactly
what I was doing manually after su-ing to root.  This script would be called
by cron several times a day.  The problem is that the script would log people
off!  For some reason the "kill -HUP 1" seems to work differently in the script
than it does manually.  Does anybody know what might be happening?  Thanks.

	#! /bin/csh -f
	# unhang dial-in lines
	set path=(/bin /usr/bin /usr/ucb /etc)
	setenv PATH /bin:/usr/bin:/usr/ucb:/etc
	cd /dev
	foreach i (`ls ttyd*`)
	set HERE=`w | grep -c $i`
	if ($HERE == 0) then
	echo "unhang $i" >/dev/console
	echo "unhang $i"
	ed /etc/ttys <<DONE1
	/$i/s/13/03/p
	w
	q
	DONE1
	kill -HUP 1
	ed /etc/ttys <<DONE2
	/$i/s/03/13/p
	w
	q
	DONE2
	kill -HUP 1
	endif
	end
-- 
"If that's true, then I'm the Pope!"		Stephen J. Hartley
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