predefined user groups list?

[Jonesy]

On Tue, 15 Mar 2022 17:13:07 -0700, Dave Stevens wrote:
> I had some trouble recently trying to set up permissions for a user to
> access a serial device (basically not knowing what I was doing). A
> friend suggested dialout as a predefined group that would do what I
> wanted. It did, so fine, but where can I find a list of predefined user
> groups?

$ cat /etc/passwd