Access seahorse passwords from terminal

Like this question , I am looking for a password repository and that I can use to feed my programs and scripts with those passwords. I found seahorse which seems to have what I need under the "Login" folder but I am not quite sure where the passwords are stored (for backup) and I don't know how to get the passwords in shell so I can pipe them into my scripts. I was under the impression that I can use gpg to access those passwords, but I don't quite know how. Is it possible to access (and create) those passwords in terminal?