# watchwho:  watch who logs in and out

PATH=/bin:/usr/bin
new=/tmp/wwho1.$$
old=/tmp/wwho2.$$
>$old		# create an empty file

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