title: Prevent interactive ssh prompts
body: <p>I have an ssh script that uses a local key for login to the remote host - nothing too exciting there.  The key is passworded and I usually add it to an agent to avoid prompting.</p>
  
  <p>Occasionally I run the program before the agent is running and it will hang waiting for the unlock phrase.  In such cases, rather than prompt interactively, I want the command to simply fail.</p>
  
  <p>Anyone know if there's an option for this?</p>