How to list all enabled services from systemctl?

systemctl list-unit-files | grep enabled will list all enabled ones.

If you want which ones are currently running, you need systemctl | grep running.

Use the one you're looking for. Enabled, doesn't mean it's running. And running doesn't mean it's enabled. They are two different things.

Enabled means the system will run the service on the next boot. So if you enable a service, you still need to manually start it, or reboot and it will start.

Running means it's actually running right now, but if it's not enabled, it won't restart when you reboot.

man systemctl states:

--state=

The argument should be a comma-separated list of unit LOAD, SUB, or ACTIVE states. When listing units, show only those in the specified states. Use --state=failed to show only failed units.

Explanation:

LOAD: Reflects whether the unit definition was properly loaded.
ACTIVE: The high-level unit activation state, i.e. generalization of SUB.
SUB: The low-level unit activation state, values depend on unit type.

Though you can also use this to only show enabled units with:

systemctl list-unit-files --state=enabled

If a unit is enabled that means that the system will start it on startup. Though setting something to enabled doesn't actually also start it so you will need to do that manually, or reboot the system after setting it to enabled.

To list all the systemd service which are in state=active and sub=running

systemctl list-units --type=service --state=running

To list all the systemd serice which are in state=active and sub either running or exited

systemctl list-units --type=service --state=active