while [ 1 ]; do tail -n 1 /mnt/USBdisk/log/$(date +%F)_M40.log tail -n 1 /mnt/USBdisk/log/$(date +%F)_M41.log sleep 2 done
while [ 1 ]; do
tail -n 1 /mnt/USBdisk/log/$(date +%F)_M40.log
tail -n 1 /mnt/USBdisk/log/$(date +%F)_M41.log
sleep 2
done