title: How to get sftp version of remote server?
body: <p>As part of trying to debug an issue, I would like to know which version of sftp is installed on the remote server where I am trying to push files.</p>
  
  <p>I was told to use <code>-vvv</code> at the command line, but I can't any documentation about it. Is there any other option? My server is Linux based.</p>
  
  <p>My other question is: say two servers have not installed the same version of SFTP, is there a kind of protocol version negotiation to make sure they 'speak the same language'? </p>