shell应用之简单计算器

 1 #!/bin/bash
 2 while :
 3 do
 4 read -p "请输入计算规则：" JS
 5 if [ -z $JS ];then
 6 exit
 7 else
 8 #echo "$JS=`echo $JS |bc`"
 9 echo $JS=`awk BEGIN"{print $JS}"`
10 fi
11 done