'Airflow scheduler --pid command not work?

I would like to ask the question about whether command of Apache Airflow is work or not. Thank you.

OS Version: Ubuntu 20.04.4 LTS

Apache Airflow Version: 2.2.5

Airflow Command: airflow scheduler --pid /xxx/xxx.pid

Expected Result: process id file will exist in /xxx/xxx.pid

Solution 1:^[1]

You must run airflow scheduler command with the daemon option together with the pid option.

Run

airflow schedule -D --pid /xxx/xxx.pid

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Solution	Source
Solution 1	Oluwafemi Sule