crontab puzzlement

[Colin Law]

On Mon, 3 Apr 2023 at 22:07, David Fletcher <dave at thefletchers.net> wrote:
>
> On Mon, 2023-04-03 at 21:22 +0100, Colin Law wrote:
> > Cron ORs together dom and dow, so if the dom is 25-30 OR dow is 1-5
> > then it will play.l
> > If you want just 25th to 30th then use * for dow
> >
> > Colin
> >
> AHA! That explains it thanks. I'm sure there must be a reason for the
> OR behaviour but it means that it can't for example do something
> different at weekends during a range of DOMs.
>
> I've edited the entries accordingly and will be checking it out
> tomorrow.
>
> The purpose of this is to run outdoor speakers via a little audio amp
> to try to attract swifts to my nest box as they return from migration
> hence I don't want to annoy my neighbours too much when they're not out
> at work during weekends.

Don't worry about it. What could be better than the screaming of
swifts to brighten up the day? No sarcasm intended in case you are
wondering.
I have a friend who did that a couple of years ago. They didn't nest
the first year, but did come and check out the box. Then in the autumn
they came round again, and the next year (which was last year) they
bred successfully.
I have been thinking of trying it myself, but have left it too late
for this year.

Colin


>
> Dave
>
>
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