Your SSH agent is running and you want to see the fingerprints of the identities it is currently holding in memory. Type the complete command.
LPIC-1 Exam 102-500, objective 110. Security medium
Draft — not checked yet. This question was written from the published exam objectives and cites the clause it comes from, but nobody has yet read it against that clause and signed for it.
It is kept out of search results and out of mock exams until they have. Read the source below before you take the answer as settled.
Answer
Type the answer.
Accepted answer
ssh-add -l
Case sensitive — Linux is, and grading LS as ls would teach a falsehood.
Why
ssh-add -l lists the fingerprint of every private key the running agent currently holds; -L prints the full public keys instead of fingerprints. `ssh-add` with no arguments loads the default keys from ~/.ssh (id_rsa, id_ecdsa, id_ed25519 and so on), `ssh-add path/to/key` loads a named key, `ssh-add -d` removes one identity and `ssh-add -D` removes them all. Every one of these commands talks to the agent through the socket named by SSH_AUTH_SOCK, so if that variable is unset you get 'Could not open a connection to your authentication agent'.
Where this comes from
- Cited
- LPI exam objective 110.3
- What it says
- Use ssh-agent and ssh-add to hold decrypted private keys for reuse.
Practise this
Reading one question is not practice. The trainer will draw a set from objective 110 and space the ones you get wrong.