As Discord GSM+ needs to be constantly running we recommend utilizing forever.js which will keep it online even when you exit the shell session. You could also use tmux, screen or others depending on your preference.
Install forever.js with below comand:
npm install forever -g
Starting and Stopping Discord GSM+
While still being inside the installation folder issue:
forever start index.js
to start it.
forever stop index.js
to stop it.