#!/bin/bash
operators="+ - X / exit"
echo 'please inpunt num1:'
read num1
echo 'please input num2'
read num2
echo 'select a operator:'
select o in $operators
do
case $o in
+)
echo "$num1+$num2=$[$num1+$num2]"
;;
-)
echo "$num1-$num2=$[$num1-$num2]"
;;
X) #因爲*在此處表示所有,,所以用X表示乘,其他方法沒試過。
echo "$num1*$num2=$[$num1*$num2]"
;;
/)
echo -n "$num1/$num2="
awk 'BEGIN{printf "%.2f\n",'$num1' / '$num2'}'
;;
exit)
echo 'byebye'
exit 0
;;
esac
done
知識點:
read腳本參數,select用法,case用法,awk用法,echo -n不換行輸出
簡單的計算器