腳本如下

#!/bin/bash

read -t 30 -p "請輸入數值1：" num1

read -t 30 -p "請輸入數值2：" num2

read -t 30 -p "請輸入運算符：" ope

if [ -n "$num1" -a -n "$num2" -a -n "$ope" ]

then

test1=$(echo $num1 | sed 's/[0-9]//g')

? ? ? ? test2=$(echo $num2 | sed 's/[0-9]//g')

if [ -z "$test1" -a -z "$test2" ]

then

if [ "$ope" == '+' ]

then

sum = $(($num1+$num2))

elif [ "$ope" == '-' ]

then

sum = $(($num1-$num2))

elif [ "$ope" == '*' ]

then

sum = $(($num1*$num2))

elif [ "$ope" == '/' ]

then

sum = $(($num1/$num2))

else

echo "只支持加減乘除四種運算符！"

exit 10

fi

else

echo "必須輸入數字！"

exit 11

fi

else

echo "輸入的數值或運算符不能為空！"

exit 12

fi

echo "$num1 $ope $num2 = $sum"?