Shell脚本编写登陆小程序.sh

#!/bin/bash
#Author:GaoHongYu
#QQ:1061767621
#Time:2019-12-19 02:47:09
#Name:login.sh
#Version:V1.0

FILE_PATH=/root/user_list                                                                          

read -p "Please enter user name:" user
grep -w $user $FILE_PATH &> /dev/null
if  [ $? -eq 0 ];then
     echo -n "Please enter passwd:"
     read -s passwd
     password=$(grep -A 1 $user $FILE_PATH|tail -1)
     if [ $passwd == $password ];then
             echo
             echo "Land successfull"
     else
             echo
             echo "Wrong password"
         fi
 else
     echo "${user} user not exist "
     read -p "Whether to create users,To create a user enter y,To exit press q:" choose
     if [ $choose == 'y' ];then
          read -p "Please enter user name:" new_user
          grep -w $new_user $FILE_PATH &> /dev/null
          if [ $? -eq 0 ];then
             echo "$new_user already existed"
     else
         echo "$new_user" >> $FILE_PATH
         read -p "Please $new_user enter passwd:" new_passwd
         echo "$new_passwd" >> $FILE_PATH
         echo "User $new_user creating successful"
         fi
     elif [ choose == 'q' ];then
         echo "exit program"
         exit
     fi
 fi             

测试：