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Open Terminal.
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Paste the text below, substituting in your GitHub email address.
ssh-keygen -t rsa -b 4096 -C "[email protected]"
This creates a new ssh key, using the provided email as a label.
When you're prompted to Enter a file in which to save the key,
press Enter. (This accepts the default file location).
Enter a file in which to save the key (/Users/you/.ssh/id_rsa): [Press enter]
At the prompt, type a secure passphrase. For more information, see Working with SSH key passphrases
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Enter passphrase (empty for no passphrase): [Type a passphrase]
Enter same passphrase again: [Type passphrase again]