#!/bin/bash #author:zhanghongjun #version:1.0 #date:2011年 12月 14日 星期三 21:18:18 CST   function information {   echo "---------------------------"   echo "圖書館管理系統（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"   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 [ $? -ne 0 ];then     echo "刪除圖書失敗"     echo "你要刪除的圖書不存在"   fi   information }  #列出所有圖書的信息 function list {   echo -e "編號/t書名/t作者/t價格"   cat .book.txt   echo "----------------------------"   information    }   #下面的函數用到的查詢菜單 function search_menu {   echo;echo "----------------------------"    echo -n "|";echo -e "1：/t按圖書編號查詢"   echo -n "|";echo -e "2：/t按圖書書名查詢"   echo -n "|";echo -e "3：/t按圖書作者查詢"   echo -n "|";echo -e "4：/t按圖書價格查詢"   echo -n "|";echo -e "5|q：/t退出查詢系統"   echo;echo "----------------------------"   } function search {   search_menu   read -p "請輸出你的選擇：" myselect   case "$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/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/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/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/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