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read -p "please input sz01:" -t 30 a
read -p "please input (+ - * /):" -t 30 b
read -p "pleade input sz02:" -t 30 c
sum=$(($a+$b+$c))
echo "$sum"
计算器脚本
原文地址:http://blog.51cto.com/13715165/2106460