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Check Whether You Already Have an SSH Key

Lists the key pairs already on this machine before you create another one.

A pair is two files: id_ed25519 is private and never leaves the machine, id_ed25519.pub is public and is what you hand to servers and GitHub.

When you need this: Always, as the first step. Generating a key over an existing one at the same path destroys access everywhere that key was trusted.

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