Comando ssh-keygen: criar chaves SSH com exemplos

Exemplos de ssh-keygen para criar chaves SSH Ed25519 ou RSA, escolher arquivo, adicionar frase-senha, ver fingerprint e testar GitHub ou servidor.

• ssh-keygen is the OpenSSH command-line utility for creating and managing SSH key pairs.
• The recommended modern command is ssh-keygen -t ed25519 -C "you@example.com".
• Use ssh-keygen -t rsa -b 4096 only for older systems that do not support Ed25519.

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