Lists forks of all private repos in your org. Relies on .netrc setup.

private_repos.rb

#!/usr/bin/env ruby

require 'octokit'

if ARGV[0]

  @client = Octokit::Client.new(:netrc => true, :per_page => 100,
    :auto_traversal => true, :auto_paginate => true)
  @client.login

  private_repos = @client.org_repos(ARGV[0].to_s, {:type => 'private'}).select {
    |repo| ! (repo[:forks_count] == 0 || repo[:archived])
  }

  private_repos.each do | repo |
    begin
      ghforks = @client.network(repo[:full_name])
      puts repo[:full_name]
      ghforks.each do | ghfork |
        puts "  ↳ " + ghfork[:full_name]
      end
    rescue Octokit::RepositoryUnavailable
      next
    end
  end
else
  STDERR.puts 'Organisation required. Example: ./private_forks.rb ITV'
end