How to tell which version of a gem a rails app is using

Question

I\'m investigating a rails app - the prod server has two version of a specific gem installed, how can I tell which version the prod app is using?

Answer 1

try this one for local gem :

gem list gemname | grep -P '(^|\s)\Kgemname(?=\s|$)'

If you use bundle:

bundle exec gem list gemname | grep -P '(^|\s)\Kgemname(?=\s|$)'