ターミナル上でrubyとrailsのバージョンを確認する方法をメモしておく。
ruby
ruby -v
rails
rails -v
（例）
username@computernames-MacBook-Pro currentdirectory % rails -v
Rails 6.0.4
username@computernames-MacBook-Pro currentdirectory % ruby -v
ruby 2.6.5
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