> On Jun 28, 2018, at 0:52, Eric Abrahamsen <eric@ericabrahamsen.net> wrote:
> 
>> $ git diff HEAD@{1}
>> 
>> shows the difference between HEAD and the previous state of HEAD.
> 
> That was new to me -- thanks! Just for completeness' sake, the explicit
> (non-relative) way of doing this would be to look at the top of the
> fast-forward message and use the updated-from commit as an anchor:
> 
> From git.sv.gnu.org <http://git.sv.gnu.org/>:/srv/git/emacs
>   61f73703c7..ce54573dac  master     -> origin/master
>   12c77f6918..9134c841f1  emacs-26   -> origin/emacs-26
> Updating 61f73703c7..ce54573dac

> $ git log 61f73703c7..


I'm glad I asked. Thank you all !

Jean-Christophe Helary
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http://mac4translators.blogspot.com @brandelune