需求：输入用户名和密码，认证成功后显示欢迎信息，输错三次后锁定

shell：

#!/bin/bash# Auth user loginuser="hlf"pass="123456"lock_file=login.lock[ -f ${lock_file} ] || touch ${lock_file}for i in `seq 3`do        read -p "username:" username        read -p "password:" password        if [ -z "$username" -o -z "$password" ];then                echo "用户名和密码不能为空,请重新登陆:"                LoginSuccess='false'        elif grep -q "\b$username\b" ${lock_file};then                echo "账户被锁定，请联系管理员！"                LoginSuccess='lock'        else                if [ "$username" = $user -a "$password" = $pass ];then                        echo "welcome to my system"                        LoginSuccess='true'                else                        echo "用户名或密码错误，请重新登陆："                        LoginSuccess='false'                fi        fi        [ $LoginSuccess = true -o $LoginSuccess = lock ] && breakdoneif [ $LoginSuccess = false ];then        echo "登陆三次失败,账户被锁定！！！"         [ -z "$username" ] || echo "$username" >> ${lock_file}fi

python:

user.txt格式：

用户名 密码

#!/usr/bin/python#encoding: utf-8# Auth user loginuser_file = "user.txt"lock_file = "login.lock"#生成字典,保存用户名密码user_dict = {}f = file(user_file)for line in f.readlines():        user_dict[line.split()[0]] = line.split()[1]f.close()#定义元组，保存被锁定的账户lock_tup = ()f = file(lock_file)for line in f.readlines():        line = line.strip('\n')        tup = (line,)        lock_tup = lock_tup + tupf.close()#用户认证for i in range(3):        username = raw_input("username:").strip()        password = raw_input("password:").strip()        if len(username) == 0 or len(password) == 0:                print "用户名和密码不能为空,请重新登陆:"                LoginSuccess='false'        elif username in lock_tup:                print "账户被锁定，请联系管理员！"                LoginSuccess='lock'        else:                if  password == user_dict[username]:                        print "welcome to my system"                        LoginSuccess='true'                else:                        print "用户名或密码错误，请重新登陆："                        LoginSuccess='false'        if LoginSuccess == "true" or LoginSuccess == "lock":break#循环三次后if LoginSuccess == "false" and username != "":        print "登陆三次失败,账户被锁定！！！"        f = file(lock_file,'a')        f.write(username + '\n')        f.close