#!/bin/bash

num1=10
num2=2

#兩個數相加
add=$[$num1+$num2]
echo $num1 + $num2 '=' $add

#兩個數相減
sub=$[$num1-$num2]
echo $num1 - $num2 '=' $sub

#兩個數相乘
mut=$[$num1*$num2]
echo $num1 '*' $num2 '=' $mut

#兩個數相除
div=$[$num1/$num2]
echo $num1 / $num2 '=' $div

#固定值
temp=$[$num1*10]
echo $num1 '*' 10 '=' $temp