get_twitter_oauth_credentials.rb

#!/usr/bin/ruby

if ARGV.length != 2
  puts <<-TEXT

Error: wrong number of arguments. Include your app's consumer token and secret:

  get_twitter_oauth_credentials.rb CONSUMER_TOKEN CONSUMER_SECRET

Get your consumer token and secret by registering your app at https://twitter.com/apps

TEXT
  exit
end

require 'rubygems'
require 'twitter'

consumer_token, consumer_secret = *ARGV

oauth = Twitter::OAuth.new(consumer_token, consumer_secret)

rtoken = oauth.request_token.token
rsecret = oauth.request_token.secret

%x(open http://#{oauth.request_token.authorize_url})

puts 'Please authorize with Twitter and enter the PIN:'
pin = STDIN.gets.chomp

oauth.authorize_from_request(rtoken, rsecret, pin)

puts "Access Token: #{oauth.access_token.token}"
puts "Access Secret: #{oauth.access_token.secret}"