predefined user groups list?

[Colin Law]

On Wed, 16 Mar 2022 at 13:09, Jonesy via ubuntu-users
<ubuntu-users at lists.ubuntu.com> wrote:
>
> 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

Isn't that a list of users, not groups?

Colin