my_github_repo.rb

#!/usr/bin/env ruby

require "json"
require "open-uri"

URL = "https://api.github.com/users/dtan4/repos"

json = open(URL).read
repositories = JSON.parse(json, symbolize_names: true)

repositories.each do |repo|
  next if Dir.exist?(repo[:name])
  system "git", "clone",  repo[:ssh_url]
end