Xref: utzoo comp.sys.att:2290 comp.unix.questions:5322
Path: utzoo!utgpu!water!watmath!clyde!rutgers!sri-unix!quintus!ok
From: ok@quintus.UUCP (Richard A. O'Keefe)
Newsgroups: comp.sys.att,comp.unix.questions
Subject: Re: Using 'exit' in a Bourne shell script
Summary: use a shell function
Message-ID: <611@cresswell.quintus.UUCP>
Date: 30 Jan 88 09:47:59 GMT
References: <169@mccc.UUCP>
Organization: Quintus Computer Systems, Mountain View, CA
Lines: 26

In article <169@mccc.UUCP>, pjh@mccc.UUCP (Peter J. Holsberg) writes:
> I would like to have my users logout via a shell script "off" rather
> than with ^d.
> Can anyone suggest a way (SysVr3.0) to do what I want?  Thanks.

Don't use a script.  Use a shell function.  Then it'll be running in
the login shell.  By the way, there is a potential surprise anyway:
	login: user-logs-in
	$ ed myfile
	!off
Here we have login shell-->ed-->subshell, and you can't log out of the
subshell.

Since you are writing records to a log file, presumably you do
something like this on login:
	echo ON $USER `tty` >>logfile
Do one more thing:

	echo $$ON $USER `tty`

Now to logout, you can do
	echo OFF $USER `tty` >>logfile
	CODE="ON $USER `tty`"
	kill -HUP `egrep -e "$CODE$" logfile | tail -1 | sed -e "s/ON.*//"`
	
This should work from a subshell.