How the command "at" works?

[David Fletcher]

On Fri, 2016-08-05 at 17:00 +0200, Ralf Mardorf wrote:
> On Fri, 5 Aug 2016 16:47:34 +0200, Hans Bieshaar wrote:
> > 
> > Good point Petter: "Have you tried 'man at'?". Exactly my thinking,
> > until I tried it myself. The result in my system is "No manual
> > entry
> > for at".Assuming that the package "at" is installed, then the man
> > pages 

In my case it wasn't installed, so I installed it just out curiosity,
and now "man at" works.