RoR/mongrel/apache2.2 equivalent to ~ in URL?

I am trying to host several RoR applications on my desktop machine. I
am in an academic environment in which I have root access on the
machine (e.g. I can install software, edit httpd.conf files, etc), but
I am not able to alter the DNS of the box, nor its IP.

In my httpd.conf, I have UserDir set up, so that with HTML/PHP/...
it's easy to get multiple applications with URLs like
  $(HOST)/~$(USER)/app1
  $(HOST)/~$(USER)/app2
  $(HOST)/~$(USER)/app3
although sometimes I present a simpler URL to my students by using an
Alias in my httpd.conf.

The point is that in my old (non-RoR) way of working, I can host
several applications *without* altering DNS tables or acquiring
additional IP numbers, neither of which I am permitted to do on the
network hosting my machine. (I may as well shamefacedly admit that
I'm an academic, with no funds to host my applications
commercially ... that's why the solution has to be on the box.)

The subject line is perhaps not too informative, and probably overly
restrictive (I don't care about using ~ ... I just need multiple
apps), but I hope my question is clear from the text.

dankelley wrote:

I am trying to host several RoR applications on my desktop machine. I
am in an academic environment in which I have root access on the
machine (e.g. I can install software, edit httpd.conf files, etc), but
I am not able to alter the DNS of the box, nor its IP.

In my httpd.conf, I have UserDir set up, so that with HTML/PHP/...
it's easy to get multiple applications with URLs like
  $(HOST)/~$(USER)/app1
  $(HOST)/~$(USER)/app2
  $(HOST)/~$(USER)/app3
although sometimes I present a simpler URL to my students by using an
Alias in my httpd.conf.

The point is that in my old (non-RoR) way of working, I can host
several applications *without* altering DNS tables or acquiring
additional IP numbers, neither of which I am permitted to do on the
network hosting my machine. (I may as well shamefacedly admit that
I'm an academic, with no funds to host my applications
commercially ... that's why the solution has to be on the box.)

The subject line is perhaps not too informative, and probably overly
restrictive (I don't care about using ~ ... I just need multiple
apps), but I hope my question is clear from the text.

This isn't exactly like your setup but take a look at this:

http://www.ruby-forum.com/topic/103998#231127

Yes, I saw your advice there. Actually I also posted there
(10.04.2007 13:48) with my difficulty: images don't show up.