terminal lock

#!/bin/sh
## ~/bin/tlock ##
PASS='12345'
trap '' TERM INT
BAD="true"
clear
while [ "$BAD" == "true" ] ; do
    echo -en "\ntlock password: "
    stty -echo;
    read x
    stty echo;
    [ "$x" == "$PASS" ] && BAD="false"
done
echo "";

UPDATE 2004-12-02: Add “trap '' TERM SIGTSTP” for additional security.