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