Henrik's questions

Is there any method (via CLI) of knowing if the server I'm at has IPv4 or IPv6?

EDIT: As for the reason why I'm asking this question (apologies if I wasn't specific enough), I'm referring to this guide by my host (Linode).

Specifically, they say (under the section about updating /etc/hosts) that:

"If you have IPv6 enabled on your Linode, you will also want to add an entry for your IPv6 address […]".

So, I'm simply wondering if and how you can figure this out via commandline. (My OS is Ubuntu 11.10 Oneiric.)

UPDATE: Apart from ifconfig, it seems the ping6 utility might prove useful, as hinted to in this article.

BACKGROUND:

I've downloaded Emacs from Github's Emacs mirror (commit f92c4be63204ed0bd914). Using Mac OS X 10.6.4, I'm now about to compile and install Emacs.app.

MY QUESTION:

The nextstep/INSTALLATION doc states nothing about make boostrap. Whereas, at various places on the Internet (following the ./configure --with-ns step but before the make step), I often see that 'boostrap' part included in the installation process.

I'm just wondering what make bootstrap does, and if it's beneficial or even needed?