for HOST in $HOST1 $HOST2 $HOST2
do
    HEARTBEAT=$(${LDAPSEARCH} -h ${HOST} -p ${PORT} -D "${USER}" -w $${PASS} -b "" -s base "(objectClass=*)" | grep dn: | sed 's/dn:/dn/g')
    if [ $HEARTBEAT = 'dn' ]; then
        echo "ok"
    else
        echo "NOT OK"
    fi
done

$OK
$OK
$OK

$NOT OK
$NOT OK
$NOT OK

$OK
else
$NOT OK