ruby on rails - How to handle gemset -

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i new rails. each time open new terminal in linux, tells gem missing. have installed gem in same folder in different terminal. please advise how can fix problem.

rails gemsets can bit tricky. can global, rails-version specific or project specific. guess using global gemset. in project terminal can run 

gem list

to see gems available in project. if don't find 1 in list, make sure have in gemfile. , again run

bundle install

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