ssh - debug1: Offering public key: username@hostname -

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I am trying to configure my laptop with my old key though still a SSP key is missing. During an SSH-V connection, I still have the key available on my old machine, but not new: 

  ... debug1: offering public key: username @ hostname .. .   
 How do I export this key?  
 Thank you!   
 
 
 Someone should use all the available keys in the following top list:  
 < Code> ssh-add -l   
 This output is given, it is easy to track the used public / private key pair.

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