Quote Originally Posted by abcd567 View Post
Any command like "fr24feed" or "fr24feed -foo" or "fr24feed --foo" will start a NEW instance of fr24feed.
The systemd service has already started fr24feed.
Why you have to start it again by any other command?

To check status, use this command:
abcd@ubuntu-bionic:~$ sudo systemctl status fr24feed 

[sudo] password for abcd:

● fr24feed.service - Flightradar24 Decoder & Feeder
   Loaded: loaded (/lib/systemd/system/fr24feed.service; enabled; vendor preset: enabled)
   Active: active (running) since Sat 2019-03-30 03:38:00 EDT; 8min ago
 Main PID: 702 (fr24feed)
    Tasks: 10 (limit: 2318)
   CGroup: /system.slice/fr24feed.service
           └─702 /usr/bin/fr24feed

Mar 30 03:38:00 ubuntu-bionic systemd[1]: Started Flightradar24 Decoder & Feeder.
I'm unsure that is accurate across all versions.

I had a user reply to me, straight up tell me I was wrong. And that on his linux install the <space> --status | was the only valid one.

Just as Stealth found, while the later version Pi Build, includes fr24feed-service.
Similar needs to be investigated on .deb packages and older versions. As once upon a time 'fr24feed-status' didn't exist.
refer https://forum.flightradar24.com/thre...ll=1#post68021

$ sudo service fr24feed status
[ ok ] FR24 Feeder/Decoder Process: running.
[ ok ] FR24 Stats Timestamp: 2015-07-01 07:55:45.
[ ok ] FR24 Link: connected [UDP].
[ ok ] FR24 Radar: T-XXXX12.
[ ok ] FR24 Tracked AC: 2.
[ ok ] Receiver: connected (3313 MSGS/0 SYNC).
[ ok ] FR24 MLAT: ok [UDP].
[ ok ] FR24 MLAT AC seen: 5.
(side note, I will edit that shortly)

pi@raspberrypi:~ $ dpkg-query -L fr24feed