shell脚本语言实现简单的图书管理系统

1#!/bin/bash
2#author:zhanghongjun
3#version:1.0
4#date:2011年 12月 14日 星期三 21:18:18 CST
5 
6 
7function information
8{
9    echo "---------------------------"
10    echo "国家图书馆管理系统（5.4版本）"
11    echo
12    echo -n "| " ;echo "1:添加图书"
13    echo -n "| " ;echo "2:删除图书"
14    echo -n "| " ;echo "3:图书列表"
15    echo -n "| " ;echo "4:查找图书"
16    echo -n "| " ;echo "5|q:退出系统"
17    echo
18    echo "---------------------------"
19    read -p "请输入你的选择:" a
20     
21 
22    case "$a" in
23    1)
24        add ;;
25    2)
26        delete ;;
27    3)
28        list ;;
29    4)
30        search;;
31    5|q|Q)
32        return -1 ;;
33    *)
34        information ;;
35    esac
36}
37 
38 
39function file_exist
40{
41    if [ ! -f .book.txt ];then
42        touch .book.txt
43    fi
44}
45 
46 
47function add
48{
49    read -p "请输入图书的编号：" number
50    read -p "请输入图书的书名：" book_name
51    read -p "请输入图书的作者：" author
52    read -p "请输入图书的价格：" price 
53        echo -e "$number\t$book_name\t$author\t$price" >>.book.txt && {
54            echo "添加图书成功！"
55            echo "-------------------"
56        }
57    if [ $? -ne 0 ];then
58        echo "添加图书失败"
59    fi
60    information
61 
62}
63 
64function delete
65{
66    read -p "请输入要删除的图书的编号：" number
67    grep $number .book.txt &>/dev/null && {
68            sed -i '/\<'$number'\>/d' .book.txt &>/dev/null  &&
69            echo "删除图书成功"
70    echo "-------------------------"
71    }
72     
73    if [ $? -ne 0 ];then
74        echo "删除图书失败"
75        echo "你要删除的图书不存在"
76    fi
77    information
78}
79 
80#列出所有图书的信息
81function list
82{
83    echo -e "编号\t书名\t作者\t价格"
84    cat .book.txt
85    echo "----------------------------"
86    information
87     
88}
89 
90 
91#下面的函数用到的查询菜单
92function search_menu
93{
94    echo;echo "----------------------------"
95    echo -n "|";echo -e "1：\t按图书编号查询"
96    echo -n "|";echo -e "2：\t按图书书名查询"
97    echo -n "|";echo -e "3：\t按图书作者查询"
98    echo -n "|";echo -e "4：\t按图书价格查询"
99    echo -n "|";echo -e "5|q：\t退出查询系统"
100    echo;echo "----------------------------"
101 
102}
103function search
104{
105    search_menu
106    read -p "请输出你的选择：" myselect
107    case "$myselect" in
108    1)
109        read -p "请输入要查询的图书的编号：" mynumber
110        echo -e "编号\t书名\t作者\t价格\n"
111        awk '$1=='$mynumber'{print $0}' .book.txt 2>/dev/null
112                             
113        if [ $? -ne 0 ];then
114            echo "图书不存在"
115        fi
116        search
117        ;;
118    2)
119        read -p "请输入你要查询的书名：" mybook_name
120        echo -e "编号\t书名\t作者\t价格\n"
121        awk '$2~/'$mybook_name'/{print $0}' .book.txt 2>/dev/null
122        if [ $? -ne 0 ];then
123            echo "图书不存在"
124        fi
125        search
126        ;;
127    3)
128        read -p "请输入图书的作者：" myauthor
129        echo -e "编号\t书名\t作者\t价格\n"
130        awk '$3~/'$myauthor'/{;print $0}' .book.txt 2>/dev/null
131        if [ $? -ne 0 ];then
132            echo "图书不存在"
133        fi
134        search
135        ;;
136    4)
137        read -p "请输入图书的价格：" myprice
138        echo -e "编号\t书名\t作者\t价格\n"
139        awk '$4=='$myprice'{print $0}' .book.txt 2>/dev/null
140        if [ $? -ne 0 ];then
141            echo "图书不存在"
142        fi
143        search
144        ;;
145    5)
146        information
147        ;;
148    *)
149        information
150        ;;
151    esac
152 
153}
154 
155information