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インストールしたいGemの安定バージョンを見る方法

railsをインストールする時に、最新の安定バージョンを表示させたい時に困ったのでメモしておきます。

Gemの安定バージョンを表示

インストールしたいGemの安定バージョンを全部表示
gem list gemの名前 -rea
開発版を含む全部
gem list rails -rea --pre
最新安定版
gem list rails -re

バージョンを指定してGemをインストール

gem install gemの名前 -v バージョン
gem install rails -v "5.2.3"
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