opstack provides an easy way to switch between sets of env variables and generate chef/knife configs based on those settings
gem install opstack
##Importing an environment
opstack env import demo demo/accounts.json will read the json file with your config variables and save them as an encrypted json file in the opstack config directory (~/.opstack)
##Export an environment to bash
eval $(opstack env export demo) will export the environment variables for the demo enviornment
##Using the environment in a knife.rb You can see an example knife.rb that uses opstack at https://github.com/OpSitters/opstack/blob/master/demo/knife.rb
##TODO## Just about everything!