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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

calcualtor.sh file:

#!/bin/bash

set a b operation;

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

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

Running:

$ ./calculator.sh
Select operation type: + - * /
+
a=
3
b=
6
Result: 9

 

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