To install a custom addon from your terminal you need to follow step

1, SSH to your Clients sever which has a client you want to install the module

cd to the custom addons folder in: /home/odoo-data/[client-name]/var-lib-extra-addons/ then pull your addon here

come back to your odoo admin => settings => enable dev mode => update odoo apps list => install app.

How to install odoo custom addons from terminal

How to install odoo custom addons from terminal