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秘密鍵から公開鍵を生成する

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OpenSSH形式(~/.ssh/authorized_keysに使う形式)の公開鍵を生成

ssh-keygen -yf ${private_key_file} > ${public_key_file}

(参考) PEM形式の公開鍵を生成

openssl rsa -in ${private_key_file} -pubout -out ${public_key_file}
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