Are there PD programs that...

[Doug Gwyn]

>	(1) start up a daemon that tells me when someone else
>	logs onto the system?

	#!/usr/5bin/sh
	#	watchwho -- watch who logs in and out
	#	adapted from Kernighan & Pike

	PATH=/usr/5bin:/bin:/usr/bin

	new=/usr/tmp/wwho1.$$
	old=/usr/tmp/wwho2.$$
	trap 'rm -f $new $old; exit 1' 1 2 3 15

	>$old
	while :
	do	who >$new
		diff $old $new
		mv $new $old
		sleep 60
	done | awk '/>/ { $1 = "in:	"; print }
		    /</ { $1 = "out:	"; print }'

>	(2) that tells a su when an application opens any file
>	(for read/write/ or execute) ? Would this have to go
>	into the kernel?

This would require kernel support.  Why would you need this?