#! /bin/sh
# adapted from lock.sh by Howard G. Port and
# Evelyn Siwakowsky
# UNIX/WORLD, III:4, p. 74, Fig. 3

trap '' 1 2 3 18
stty -echo
echo "Key: \c"
read key_1
echo
echo "Again: \c"
read key_2
echo
key_3=
if [ "$key_1" = "$key_2" ]
	then
		tput clear
		until [ "$key_3" = "$key_2" ]
		do
			read key_3
		done
	else
		echo "locktty: keys do not match" 1>&2
fi
stty echo