From: Demonic Software <demonic.software@...>
Date: 2008-03-13T11:44:41+09:00
Subject: Using gems in a script or irb

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Hello,

I am in the process of trying to setup a ruby development environment (not
for Ruby on Rails), and I was wondering how I go about using ruby gems in a
script or from irb.  I have tried setting the environment variables in the
two following ways:

$ printenv | grep GEM
GEM_HOME=/usr/lib/ruby/gems/1.8/gems/
GEM_PATH=/usr/lib/ruby/gems/1.8/gems/
$ ls $GEM_PATH
hoe-1.5.0  hoe-1.5.1  ParseTree-2.1.1  rake-0.8.1  ruby2ruby-1.1.8
rubyforge-0.4.4  rubyforge-0.4.5  rubygems-update-1.0.1  RubyInline-3.6.6
$ irb
irb(main):001:0> require "ruby2ruby"
LoadError: no such file to load -- ruby2ruby
        from (irb):1:in `require'
        from (irb):1
irb(main):002:0>

== and ==
$ printenv | grep GEM
GEM_HOME=/usr/lib/ruby/gems/1.8/
GEM_PATH=/usr/lib/ruby/gems/1.8/
$ ls $GEM_PATH
cache  doc  gems  source_cache  specifications
$ irb
irb(main):001:0> require 'ruby2ruby'
LoadError: no such file to load -- ruby2ruby
        from (irb):1:in `require'
        from (irb):1
irb(main):002:0>

Every time I google a majority of the links point to some documentation on
how to set-up and configure Ruby on Rails.  I am just trying to set-up an
environment, where I can write a script and use gems directly in the script
or from the irb prompt.  For example:

#foobar.rb
require 'foo' # where foo is a module in my gems directory
foo.new('bar')

$ruby foobar.rb

Thanks in advance for your help.

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