On Tue, 8 Dec 2020, Michael Kjörling wrote:

> If you have at but not cron, then implementing the other doesn't seem 
> quite as straightforward. It would certainly still be possible, but it 
> would definitely give rise to the question of "wouldn't it be real nice 
> if I could set this task up to run on a recurring basis?" followed by 
> "wouldn't it make more sense for the run-stuff-at-some-time task to run 
> from the recurring-execution tool, than the other way around?".

I've never seen a *nix (since the 70s) that didn't have CRON (in one form 
or another)...  And on my FreeBSD system, "atrun" is called every 5 
minutes, so /etc/crontab will need to be edited for finer granularity.

-- Dave