Clone or refresh all my gists

clone-mygists.rb

#!/usr/bin/env ruby

# clone-mygists.rb : clones all mygists or refreshes them

require 'rubygems'
require 'json'

mygists = `curl -u ashee -qs https://api.github.com/users/ashee/gists`
gists = JSON.load(mygists)
gists.each do |g|
  gid = g["id"].to_s
  if !File.directory?(gid)
    cmd = "git clone %s" % g["git_push_url"]
    puts cmd
    `#{cmd}`
    puts
  else
    Dir.chdir(gid)
    cmd = "git pull"
    print "refreshing #{gid}..."
    puts `#{cmd}`
    Dir.chdir("../")
  end
end