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Permission denied (publickey)
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ssh-add: illegal option -- K
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Connecting to GitHub with SSH
You can connect to GitHub Enterprise Cloud using the Secure Shell Protocol (SSH), which provides a secure channel over an unsecured network.
About SSH
Checking for existing SSH keys
Generating a new SSH key and adding it to the ssh-agent
Adding a new SSH key to your GitHub account
Testing your SSH connection
Working with SSH key passphrases