Which command line software tools are required to mine litecoin
You have miners on command line like sgminer or cgminer. You can use this with a GUI but it is not a requirement.

You can find usage guide on previous link.
Exemple for sgminer. After you build it and install it, you simply have to execute this command to lunch mining :

sgminer -o http://pool:port -u username -p password


Replace :


pool by adresse of your pool
port by the port of your mining pool 
username and password by your pool login.


If you want more information check official github of these projects