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linux C 写的图书馆学生登入界面源码

#! /bin/sh -
record_file=passwd
add_file=add
delete_file=delete
a="你的选择是:"
b="输入关键字是:"
clear
while true
do
   echo "      用户信息主菜单     "
   echo "1.打印当前所所有记录   "
   echo "2.打印当前所所有记录(格式化后)"
   echo "3.打印用户名和用户ID"
   echo "4.打印(格式化了的)用户名和拥用户ID"
   echo "5.查询特定记录"
   echo "6.增加新记录"
   echo "7.删除记录?"
   echo "q.---退出"
   echo "你的选择是:(等待用户输入)"
   echo
   read choice
   echo "$a $choice"
   case $choice in
        1)tr -s "[:]" "[ ]"<$record_file;;
        2)sort -k 1 $record_file|tr -s "[:]" "[\t]";;
        3)awk -F : '{print $1 "," $3}'  $record_file;;  
        4)awk -F : '{print $1 "\t" $3}'  $record_file|sort -k 1;;
        5)    
           while true
 do 
         echo "请输入要查询的用户名:"
               read answer
         
              echo "$b $answer"
 
          
 if  (test -z "$answer")
		then
              echo "你还没有输入"
    continue    
           elif

            (test  
       awk -F : '{print $1}' $record_file|grep -qiw  $answer) #-i 不区分大小写-w

            then          
    awk -F : '$1=="'$answer'"{print $0}' $record_file       
    break
           else

             echo "你输入的用户不存在,没有找到 $answer" 
             
           break
           fi
done  ;; 
     6)source $add_file;;
        7)source $delete_file;;
        q)exit;;
        Q)exit;;
        *)echo "无效的代码";;
   esac
   echo "请按回车继续... "
   read answer
done