shell腳本實現算術運算且輸入的不能為非數字的數，shell算術

shell腳本實現算術運算且輸入的不能為非數字的數，shell算術

#!/bin/bash
echo "請輸入第一個數"
read a
echo "請輸入第二個輸"
read b

if [[ ${b} != *[!0]* ]] && [[ ${a} != *[!0123456789]* ]];

then
echo "除數為0！！！！！！！！！！！！！！！！！"
echo "和為"`echo $(( ${a} + ${b} ))`
echo "差為"`echo $(( ${a} - ${b} ))`
echo "積為"`echo $(( ${a} * ${b}))`

elif [[ ${a} != *[!0123456789]* ]] && [[ ${b} != *[!0123456789]* ]];

then
echo "和為"`echo $(( ${a} + ${b} ))`
echo "差為"`echo $(( ${a} - ${b} ))`
echo "商為"`echo $(( ${a} / ${b} ))`
echo "積為"`echo $(( ${a} * ${b}))`
echo "余數為"`echo  $(( ${a} % ${b}))`


else

echo "輸入錯誤"

fi

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