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I have a bash script with the following line where $timestep is a decimal number.
echo $t gives the value "0.125*2" for example instead of "0.250".
How do I change this?!?
bash does not have floating point arithmetic. Any variable with a decimal point in it is treated as a string. So bash processes t=$timestep*$i as the concatenation of three strings. The strings are:
You are not going to get bash to use 0.125 as a number in an arithmetic expression.