Subject: mv --backup=numbered should perform an atomic update

From: Jim Meyering <[email-masked]>
Date: Tue, 31 Jan 2012 13:33:20 +0100

Since I'm closing the related ticket in which this was raised,
here's a new one:

In http://bugs.gnu.org/6960, Anders Kaseorg noted that
'mv --backup=numbered ...' does not perform an atomic update.
It should.