ssh-keygen

ssh-keygen is a command line tool to create SSH keys. To generate a new SSH key execute the following command:

ssh-keygen -t ed25519 [-C <email-address>]

• The -t flag specifies the type of key to generate.
• The -C flag adds a comment to the SSH key. This flag is optional but recommended. It will help indicate which SSH key belongs to which email address when using ssh-add -l or Keychain.
• <email-address> is the email address used for GitHub or Bitbucket, configured as user.email in the gitconfig file.

When prompted to “Enter a file in which to save the key”, press Enter to accept the default file location. Otherwise, if a different name or located is desired, a custom name can be specified. The default directory for storing SSH keys is ~/.ssh/. Press Enter until the file is generated.