Support for posix-rename@openssh.com extension

It would be useful to have an option to make use of the posix-rename@openssh.com extension when available.

This provides an alternative to the link/remove rename operation which is not supported on all file systems. In addition, it prevents the scenario where a link is successful and delete fails, leaving two files on the system.

Thanks for your suggestion.
Will see if more people ask for this.

I would also like to officially ask for this. SFTP servers backed by HDFS via NFS Gateway do not support hard links and thus cannot service the rename command. The posix-rename@openssh.com extension provides an alternative renaming method that does not result in an NFS LINK command, but instead, an NFS RENAME command.

OK, thanks for your vote.