手元に秘密鍵だけある場合に、公開鍵がほしい際に ssh-keygen コマンドから生成できるとのことでメモ書き📝
ssh-keygen -y -f ~/.ssh/id_rsa > ~/.ssh/id_rsa.pub
AWS の pem だけもっているときとかで突然公開鍵が必要な時に便利
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