Shell编程之流程控制——案例使用
shell 编程中所包含的流程控制语句有if case for while
下面结合上述控制流程语句格式写出一个简单案例，将其互相嵌套使用，适合新手学习，shell熟练者请自动忽略。
#!/bin/bash
echo "欢迎来到我的超市!"
echo "正在加载页面,加载中,请稍后3s......"
sleep 3
echo -e "\033[1;36m ############################################ \033[0m"
echo -e "\033[1;36m -----------------follow choice-------------- \033[0m"
echo -e "1)shopping \t 2)exit "
echo -e "\033[1;36m ############################################ \033[0m"
read -p "请输入你的选择（1或者2） :" num
let price1=128
let price2=118
let price3=228
let price4=12
let price5=45
let price6=2
let sum=0
let sum1=0
let sum2=0
let count1=0
let count2=0
let count3=0
let count4=0
let count5=0
let count6=0
echo -e "shoplist price" > shoplist.txt
while true
do
if [ $num -ne 1 ]
then
echo "即将离开!"
exit 0
else
echo "有以下两个商店!"
echo -e "1)衣服 \t 2)文具 "
read -p "please input your choice {1 or 2}:" choice
case $choice in
1)
echo -e "\033[5;36m 欢迎来到衣服店! \033[0m"
while true
do
echo -e "\033[1;35m-----------goods list------------------ \033[0m"
echo -e "1)shoes ￥128 \t2)jeans ￥118 \t3)jacket ￥228"
read -p "你想买点啥？请输入商品序号 {1 or 2 or 3}，其他键则离开:" key
case $key in
1)
echo "your choice is $key"
echo -e "shoes\t ￥128" >> shoplist.txt
let sum+=$price1
let sum1+=$price1
let count1+=1
;;
2)
echo "your choice is $key"
echo -e "jeans\t ￥118" >> shoplist.txt
let sum+=$price2
let sum1+=$price2
let count2+=1
;;
3)
echo "your choice is $key"
echo -e "jacket\t ￥228" >> shoplist.txt
let sum+=$price3
let sum1+=$price3
let count3+=1
;;
*)
echo "you choose leave,welcome to come again!"
echo -e "\r"
break
esac
done
;;
2)
echo -e "\033[5;36m 欢迎来到文具店! \033[0m"
while true
do
echo -e "\033[1;34m-----------goods list------------------ \033[0m"
echo -e "1)pen ￥12 \t 2)book ￥45 \t 3)ruler ￥2"
read -p "你想买点啥？请输入商品序号 {1 or 2 or 3}，其他键则离开:" key
case $key in
1)
echo "your choice is $key"
echo -e "pen\t ￥12" >> shoplist.txt
let sum+=$price4
let sum2+=$price4
let count4+=1
;;
2)
echo "your choice is $key"
echo -e "book\t ￥45" >> shoplist.txt
let sum+=$price5
let sum2+=$price5
let count5+=1
;;
3)
echo "your choice is $key"
echo -e "ruler\t ￥2" >> shoplist.txt
let sum+=$price6
let sum2+=$price6
let count6+=1
;;
*)
echo "you choose leave,welcome to come anain!"
echo -e "\r"
break
esac
done
;;
*)
echo "you may come to other market!"
break
esac
fi
done
if [ $sum -ne 0 ]&&[ $sum -le 500 ]
then
echo "您购买的货物清单是："
cat shoplist.txt
echo "其中你在衣服店买了$count1双鞋，买了$count2条牛仔裤，买了$count3件夹克衫！在该店一共花费￥$sum1"
echo "其中你在文具店买了$count4支笔，买了$count5本书籍，买了$count6把尺！在该店一共花费￥$sum2"
echo "正在计算商品总价,请稍等3s......"
sleep 3
echo "your cost total is ￥ $sum"
elif [ $sum -gt 500 ]
then
echo -e "您购买的货物清单是：\r"
cat shoplist.txt
echo "其中你在衣服店买了$count1双鞋，买了$count2条牛仔裤，买了$count3件夹克衫！在该店一共花费￥$sum1"
echo "其中你在文具店买了$count4支笔，买了$count5本书籍，买了$count6把尺！在该店一共花费￥$sum2"
echo "你花了￥ $sum，准备回去跪键盘吧！"
else
echo "你来逛了一下，并没有买任何商品"
fi
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