Shell编程之流程控制——案例使用

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/bashecho "欢迎来到我的超市!"echo  "正在加载页面,加载中,请稍后3s......"sleep 3echo -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） :" numlet price1=128let price2=118let price3=228let price4=12let price5=45let price6=2let sum=0let sum1=0let sum2=0let count1=0let count2=0let count3=0let count4=0let count5=0let count6=0echo -e "shoplist  price" > shoplist.txtwhile 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    fidoneif [ $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