Linux 下 shell 编写 计算器

vim  t1

read -p "input num1:" a

read -p "input num2:" b

read -p "input opeartor:" o

case $o in

+)echo "scale=2;$a+$b"|bc;;

-)echo  "scale=2;$a-)$b"|bc;;

/)echo "scale=2;$a/$b"|bc;;

*)echo "scale=2;$a/$b"|bc;;

esac