Script to find all your repositories that have a particular collaborator.

gistfile1.rb

require 'rubygems'
require 'github_api'

username = ARGV[0]
password = ARGV[1]
collaborator_for_deletion = ARGV[2]

client = Github.new(login: username, password: password)
repositories = client.repos.list

repositories.each_page do |page|
  page.each do |repository|
    if client.repos.collaborators.collaborator?(username, repository.name, collaborator_for_deletion)
      puts "#{repository.name}: #{repository.html_url}/admin/collaboration"
    end
  end
end