macOS Sierra にしたら SSH の度にパスフレーズを求められる問題の解決方法 | DriftwoodJPAddKeysToAgent Specifies whether keys should be automatically added to a running ssh-agent(1). If this option is set to ``yes'' and a key is loaded from a file, the key and its passphrase are added to the agent with the default lifetime, as if by ssh-add(1). If this option is set to ``ask'', ssh will require confirmation using the SSH_ASKPASS program before adding a key (see ssh-add(1) for details
