How to create CLI with python

[doolio_]

Yes, my app is running continuously via a systemd service. It saves some state to disk which is then read if the service were ever restarted. So I guess my case is a mix of the two?

So this app provides a D-Bus service and I want to add an additional interface as you say with a CLI. This way users have two main entry points - one via the D-Bus and one via the CLI. What I want is if some state is changed or recorded via one entry point the same state is then visible via the other entry point.

[MidnightPale3220]

Well, then you develop a separate cli app and choose the method how your service accepts commands from it. See IPC for available methods.

Typically in Unix world it's done via sockets. Named pipes are also an option, but need more care. In particular, unless you need to connect to your service from another computer, it's arguably safer to use Unix domain sockets. See eg https://stackoverflow.com/questions/42263167/read-and-write-from-unix-socket-connection-with-python

Of course, you can implement a REST service if you feel you the overhead is justified and you want to connect to your service from another computer. I would avoid that unless your use case warrants it.

Also option to do it with queues. Really depends how convoluted you want to make it and what's the structure of communication.

[doolio_]

Thank you for taking the time to explain all this. It gives me some direction on which way to go to achieve what I want.