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#!/bin/bash 
#author:zhanghongjun 
#version:1.0 
#date:2019年 9月 24日 星期二 12:18:18 CST 
 
 
function information 
{ 
  echo "---------------------------" 
  echo "圖書館管理系統(tǒng)（5.4版本）" 
  echo  
  echo -n "| " ;echo "1:添加圖書" 
  echo -n "| " ;echo "2:刪除圖書" 
  echo -n "| " ;echo "3:圖書列表" 
  echo -n "| " ;echo "4:查找圖書" 
  echo -n "| " ;echo "5|q:退出系統(tǒng)" 
  echo  
  echo "---------------------------" 
  read -p "請輸入你的選擇:" a 
   
 
  case "$a" in 
  1) 
    add ;; 
  2) 
    delete ;; 
  3) 
    list ;; 
  4) 
    search;; 
  5|q|Q) 
    return -1 ;; 
  *) 
    information ;; 
  esac 
} 
 
 
function file_exist 
{ 
  if [ ! -f .book.txt ];then 
    touch .book.txt 
  fi 
} 
 
 
function add 
{ 
  read -p "請輸入圖書的編號：" number 
  read -p "請輸入圖書的書名：" book_name 
  read -p "請輸入圖書的作者：" author 
  read -p "請輸入圖書的價格：" price  
    echo -e "$number\t$book_name\t$author\t$price" >>.book.txt && { 
      echo "添加圖書成功！" 
      echo "-------------------" 
    } 
  if [ $? -ne 0 ];then 
    echo "添加圖書失敗" 
  fi 
  information 
 
} 
 
function delete 
{ 
  read -p "請輸入要刪除的圖書的編號：" number 
  grep $number .book.txt &>/dev/null && { 
      sed -i '/\<'$number'\>/d' .book.txt &>/dev/null && 
      echo "刪除圖書成功"  
  echo "-------------------------" 
  } 
   
  if [ $? -ne 0 ];then 
    echo "刪除圖書失敗" 
    echo "你要刪除的圖書不存在" 
  fi 
  information 
} 
 
#列出所有圖書的信息 
function list 
{ 
  echo -e "編號\t書名\t作者\(yùn)t價格" 
  cat .book.txt 
  echo "----------------------------" 
  information 
   
} 
 
 
#下面的函數(shù)用到的查詢菜單 
function search_menu 
{ 
  echo;echo "----------------------------"  
  echo -n "|";echo -e "1：\t按圖書編號查詢" 
  echo -n "|";echo -e "2：\t按圖書書名查詢" 
  echo -n "|";echo -e "3：\t按圖書作者查詢" 
  echo -n "|";echo -e "4：\t按圖書價格查詢" 
  echo -n "|";echo -e "5|q：\t退出查詢系統(tǒng)" 
  echo;echo "----------------------------"  
 
} 
function search 
{ 
  search_menu 
  read -p "請輸出你的選擇：" myselect 
  case "$myselect" in 
  1) 
    read -p "請輸入要查詢的圖書的編號：" mynumber 
    echo -e "編號\t書名\t作者\(yùn)t價格\n" 
    awk '$1=='$mynumber'{print $0}' .book.txt 2>/dev/null  
               
    if [ $? -ne 0 ];then 
      echo "圖書不存在" 
    fi 
    search 
    ;; 
  2) 
    read -p "請輸入你要查詢的書名：" mybook_name 
    echo -e "編號\t書名\t作者\(yùn)t價格\n" 
    awk '$2~/'$mybook_name'/{print $0}' .book.txt 2>/dev/null 
    if [ $? -ne 0 ];then 
      echo "圖書不存在" 
    fi 
    search 
    ;; 
  3) 
    read -p "請輸入圖書的作者：" myauthor 
    echo -e "編號\t書名\t作者\(yùn)t價格\n" 
    awk '$3~/'$myauthor'/{;print $0}' .book.txt 2>/dev/null 
    if [ $? -ne 0 ];then 
      echo "圖書不存在" 
    fi 
    search 
    ;; 
  4) 
    read -p "請輸入圖書的價格：" myprice 
    echo -e "編號\t書名\t作者\(yùn)t價格\n" 
    awk '$4=='$myprice'{print $0}' .book.txt 2>/dev/null 
    if [ $? -ne 0 ];then 
      echo "圖書不存在" 
    fi 
    search 
    ;; 
  5) 
    information 
    ;; 
  *) 
    information 
    ;; 
  esac 
 
} 
 
information