#!/bin/bash read -t 30 -p "输入运算操作符:" oper if [[ $oper != "+" && $oper != "-" && $oper != "*" && $ope
#!/bin/bash
read -t 30 -p "输入运算操作符:" oper
if [[ $oper != "+" && $oper != "-" && $oper != "*" && $oper != "/" ]]
then echo "oper is error"
exit 0
fi
read -t 30 -p "param1:" param1
read -t 30 -p "param2:" param2
case $oper in
"+") result=`expr $param1 + $param2`
;;
"-") result=`expr $param1 - $param2`
;;
"*") result=`expr $param1 /* $param2`
;;
"/") result=`expr $param1 / $param2`
;;
*) echo "error"
;;
esac
echo $result
