knife-env-diff
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A plugin for Chef::Knife which will diff the cookbook versions of two or more environments.
``` $ knife environment diff /home/bgoad/.rvm/gems/ruby-2.1.0/gems/knife-env-diff-0.0.4/lib/chef/knife/env-diff.rb:75:in `get_cookbook_version': undefined method `[]' for nil:NilClass (NoMethodError) from /home/bgoad/.rvm/gems/ruby-2.1.0/gems/knife-env-diff-0.0.4/lib/chef/knife/env-diff.rb:51:in `block (3 levels) in run' from /home/bgoad/.rvm/gems/ruby-2.1.0/gems/knife-env-diff-0.0.4/lib/chef/knife/env-diff.rb:50:in `each' from /home/bgoad/.rvm/gems/ruby-2.1.0/gems/knife-env-diff-0.0.4/lib/chef/knife/env-diff.rb:50:in `block (2 levels) in run'...