Quote:
Originally Posted by vucni45
The timer unit will be enabled and start at boot and the service unit will be disabled-it will be started by timer unit and after execution will stop.right?
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Depends on the unit configuration files, i.e. someunit.timer and someunit.service.
It's simple really: systemd is PID 1 and runs all the time. I don't think it starts someunit.timer as a separate process - it simply looks what the timer says, when it should execute its service.
You are asking wide open question that are better answered by reading documentation.
systemd has excellent documentation, both offline (man pages on your machine) and online.