Lastpass-cli is the command-line interface of the Lastpass password manager. It can be downloaded by typing
sudo apt install lastpass-cli
in the terminal of GNU/Linux, Cygwin and Mac OS X system. It is invoked by typing 'lpass'.
I have logged in using my username, master password, 2FA key. I am trying to access using lpass one of the passwords stored in my Lastpass vault. I know both the username and rough structure of the URL. I tried lpass show But I am unable to decipher the man page to decide what should I type to get the password.
To show the password just run
lpass show YOUR_KEY
If you already know the key name, if not you can combine it using grep to find you secret password name.
Check this tutorial to learn how to use lpass cli
https://yallalabs.com/linux/how-to-install-lastpass-cli-linux.