From: a99.googlegroups.a99@...
Date: 2009-03-28T00:51:40+09:00
Subject: Re: howto gem thru a proxy

Does this work for you:

gem query --remote --name-matches doom -p  http://terra.sol.proxy.org:8080
where:
"http://terra.sol.proxy.org:8080" is <proxy>:<port>

I took it from here:
http://docs.rubygems.org/read/book/1

and:
http://docs.rubygems.org/read/chapter/13#page51

--Axel