On Fri 21 Jan 2022 at 16:11:13 (+0100), Steve Keller wrote: > "Roberto C. Sánchez" <robe...@debian.org> wrote: > > > New users have gid 100 set as their primary group by default. So, new > > users are members of the group without having to be added to the group > > in /etc/groups. > > Hmm, at least not on two Debian systems (stretch and bullseye), I have > running here: > > # cat /etc/debian_version > 9.13 > # useradd -c Foo foo > # id foo > uid=1021(foo) gid=1021(foo) groups=1021(foo) > > > # cat /etc/debian_version > 11.2 > # useradd -c Foo foo > # id foo > uid=1020(foo) gid=1020(foo) groups=1020(foo)
You're encouraged to use adduser rather than useradd. But in both cases, what they do is configured with, respectively, /etc/adduser.conf and /etc/default/useradd, q.v. Cheers, David.