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gem list --no-versions > /tmp/gemlist
rbenv global 2.1.0
gem install `cat /tmp/gemlist`

ポイントはgem listを--no-versionsオプション付けて実行するところですね。普段Ruby使ってないのでこのオプション知らなかったのですが、普段から--helpとか実行して役立ちそうなオプションをチェックしておけば良かったなって思いました。

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