Gathering summary data regularly

I’d like to gather data probably once a minute, since planes disappear after a minute from the last message. Ideally, I think the way I’d like to do this is to set up a crontab to copy the relevant file to a folder that I can then offload at my convenience.

I’ve seen messages in this forum where it looks like cron was being installed. Is cron not included in the 3.0.4 installation? What file would I need to look for to get what I’m looking for. I’m surmising that the web view uses a json file to get its data. Correct? If so, I’m guessing that’s probably what I’d want to capture. Where is this json file stored, so I know what to target with a crontab?

The 3.0.4 sdcard image includes cron.

What file would I need to look for to get what I’m looking for.

/run/dump1090-fa/aircraft.json

Thanks.

Hmmm. It looks like that folder has a rotating set of history files that are updated every 30 seconds and that the rotation period is an hour. That means I could just capture the history files once an hour to achieve the same result. Correct?

I’m not sure cron is such a good idea.
I’m sometimes gathering all the messages with the wget command, those can then be filtered and saved for later processing. An example is mentioned here:
forum.flightradar24.com/threads/ … #post59551
I filter the messages with a php script and save them as csv
AM

The json files including the history files are described here: github.com/mutability/dump1090/ … ME-json.md

I’m not using cron. Since history files are already being generated, I’m using launchd on my Mac to call a script using scp to copy them once an hour.