knife config file for multiple environments.

knife.rb

current_orgenv = ENV['CHEF_ORG'] + ENV['CHEF_MYENV']
current_dir = File.dirname(__FILE__)
  user = ENV['CHEF_USER'] || ENV['USER']
  node_name                user
  client_key               "#{ENV['HOME']}/.chef/#{current_orgenv}_#{user}.pem"
  validation_client_name   "#{ENV['CHEF_ORG']}-validator"
  validation_key           "#{ENV['HOME']}/.chef/#{current_orgenv}_validator.pem"
  chef_server_url          "#{ENV['CHEF_SERVER']}"
  syntax_check_cache_path  "#{ENV['HOME']}/.chef/syntax_check_cache"

  cookbook_path            ["#{current_dir}/../cookbooks"]
  cookbook_copyright "Stratasys Inc."
  cookbook_license "none"