scp: now using SFTP protocol by default

[Damien Miller]

On Wed, 22 Sep 2021, Demi Marie Obenour wrote:

> > FYI, I'm rolling this back for the release that will happen in a few
> > days. We want to give people a bit more time to pick up the sftp-server
> > "expand-path at openssh.com" extension to support ~user paths.
> 
> Is it still possible to explicitly enable use of the SFTP protocol,
> preferably in a way that causes old versions of scp (which don’t support
> it) to fail?

"scp -s" will do this at present.

-d