title: Any difference between "send_user" and "puts" in Expect?
body: <p>It's not clear to me if <code>send_user</code> is the same as <code>puts</code>. Every time I want to send an informative message to the user, I would wonder which one I should use. From Expect's man page, it seems like <code>send_user</code> is the same as <code>puts</code> but then what is <code>send_user</code> used for?</p>