Shell編程之流程控制——案例使用

Shell編程之流程控制——案例使用

shell 編程中所包含的流程控制語句有if case for while

下面結合上述控制流程語句格式寫出一個簡單案例，將其互相嵌套使用，適合新手學習，shell熟練者請自動忽略。

#!/bin/bash
echo "歡迎來到我的超市!"
echo  "正在加載頁面,加載中,請稍后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 "請輸入你的選擇（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 "即將離開!"
        exit 0
    else
        echo "有以下兩個商店!"
        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 歡迎來到衣服店! \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 "你想買點啥？請輸入商品序號 {1 or 2 or 3}，其他鍵則離開:" 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 歡迎來到文具店! \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 "你想買點啥？請輸入商品序號 {1 or 2 or 3}，其他鍵則離開:" 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 ]&&[ $sum -le 500 ]
then 
    echo "您購買的貨物清單是："
    cat shoplist.txt
    echo "其中你在衣服店買了$count1雙鞋，買了$count2條牛仔褲，買了$count3件夾克衫！在該店一共花費￥$sum1"
    echo "其中你在文具店買了$count4支筆，買了$count5本書籍，買了$count6把尺！在該店一共花費￥$sum2"
    echo "正在計算商品總價,請稍等3s......"
    sleep 3
    echo "your cost total is  ￥ $sum"
elif [ $sum -gt 500 ]
then
    echo -e "您購買的貨物清單是：\r"
    cat shoplist.txt
    echo "其中你在衣服店買了$count1雙鞋，買了$count2條牛仔褲，買了$count3件夾克衫！在該店一共花費￥$sum1"
    echo "其中你在文具店買了$count4支筆，買了$count5本書籍，買了$count6把尺！在該店一共花費￥$sum2"
    echo "你花了￥ $sum，準備回去跪鍵盤吧！"
else
    echo "你來逛了一下，并沒有買任何商品"
fi