On Tue, Jul 19, 2022 at 8:05 AM Tom Horsley <horsley1...@gmail.com> wrote:
>
> Anyone have an example of a systemd timer that runs at a specific
> time of day (like 1AM) so I can avoid thinking too hard? :-).

I have the following in a timer to run a prune of my backup at 6 AM Mondays:

OnCalendar=Mon *-*-* 06:00:00

So if you wanted to have a timer run daily at 1am, you could use

OnCalendar=* *-*-* 01:00:00

(If you're fine with it running at midnight, you can use OnCalendar=daily)

A more detailed discussion is at
https://www.freedesktop.org/software/systemd/man/systemd.time.html#Calendar%20Events

> Can I override an installed systemd timer by putting a replacement
> with the same name under /etc somewhere?

Admin-installed units go in /etc/systemd/system . I believe anything
you define there will override what ships in /usr/lib/systemd although
I haven't verified that myself.

-- 
Ben Cotton
He / Him / His
Fedora Program Manager
Red Hat
TZ=America/Indiana/Indianapolis
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