045_循环测试用户名与密码是否正确

#!/bin/bash
#循环测试用户的账户名和密码,最大测试 3 次,输入正确提示登录成功,否则提示登录失败
#用户名为 tom 并且密码为 123456
for i in {1..3}
do
     read -p "请输入用户名:" user
     read -p "请输入密码:" pass
     if [ "$user" == 'tom' -a "$pass" == '123456' ];then
          echo "Login successful"
          exit
     fi
done
    echo "Login Failed"