今天是周日，半夜还在玩弄因为刚学shell所以就写了个简单计算机玩玩大家不要笑话偶，之前shell一点都不会

总监让我周日把服务器内核的优化参数写个文档，没有思路啊就惆怅的了，先学学shell放松下吧。

#vi numb.sh

#chmod +x numb.sh

#cat numb.sh

#!/bin/bash
echo "先选择运算的种类 加减乘除，然后分别输入运费的数字就可以得到结果，输入时间为30秒"
 read -p "Please enter the type of operation + or - or * or / :" -t 30 f
 case "$f" in
 "+")
 read -p "Please enter the number1:" -t 30 numb1

 read -p "Please enter the number2:" -t 30 numb2
typeset -i numb3="$numb1+$numb2"
echo $numb3
 ;;
 "*")
 read -p "Please enter the number1:" -t 30 numb1
 read -p "Please enter the number2:" -t 30 numb2
 typeset -i numb3="$numb1*$numb2"
echo $numb3
;;
"-")
 read -p "Please enter the number1:" -t 30 numb1
 read -p "Please enter the number2:" -t 30 numb2
 typeset -i numb3="$numb1-$numb2"
echo $numb3
;;
"/")
 read -p "Please enter the number1:" -t 30 numb1
 read -p "Please enter the number2:" -t 30 numb2
 typeset -i numb3="$numb1/$numb2"
echo $numb3
;;
*)
echo "error,Please re-run!"
esac