Addition in bash

[Ray Parrish]

Hello,

I have the following script fragment

Seconds=0;
while [ "$Seconds" -lt "60" ]
  do
  sleep 5;
  Seconds=$Seconds+5;
  padsp espeak "$Seconds"
done

For some reason Seconds becomes "0+5" instead of the integer value 5 
which is what I am attempting to get it to be.

Does anyone know how to do integer math in bash?

Thanks for any help you can be.

Later, Ray Parrish

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