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Bash - how to write simple calculator?

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Using bash it is possible to write simple calcualtor in following way.

1. In brackets expression example file:


set a b operation;

echo -e "Select operation type: + - * /";
read operation;
echo "a=";
read a;
echo "b="
read b;

echo "Result:" $(($a$operation$b));


$ ./
Select operation type: + - * /
Result: 9


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