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全てのgemをアンインストールする
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| gem list --no-versions | grep "^[a-z]" | grep bunlder -v | grep test-unit -v | grep rdoc -v | grep rake -v | grep psych -v | grep io-console -v | grep json -v | grep bigdecimal -v | grep minitest -v | xargs gem uninstall -aIx |
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使用rubyバージョンは割りと低いので全ての2系バージョンで動くかわかりませんのでgrep -vを修正して頂けると。