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This script runs fine it is just a matter of how you run it.
download here:http://comax.fr/yamas/bt5/yamas.sh

chmod +x yamas.sh

here is the trick do not run like this
./yamas.sh

that will try to make the script run with sh instead of bash

instead invoke it this way
sudo bash ./yamash.sh

or if you install it run like this
bash yamas

Thanks for the share  :)