lamp:~# adduser --help
adduser [--home DIR] [--shell SHELL] [--no-create-home] [--uid ID]
[--firstuid ID] [--lastuid ID] [--gecos GECOS] [--ingroup GROUP | --gid ID]
[--disabled-password] [--disabled-login] user
Add a normal user
adduser --system [--home DIR] [--shell SHELL] [--no-create-home] [--uid ID]
[--gecos GECOS] [--group | --ingroup GROUP | --gid ID] [--disabled-password]
[--disabled-login] user
Add a system user
adduser --group [--gid ID] group
addgroup [--gid ID] group
Add a user group
addgroup --system [--gid ID] group
Add a system group
adduser user group
Add an existing user to an existing group
Global configuration is in the file /etc/adduser.conf.
Other options are [--quiet] [--force-badname] [--help] [--version] [--conf
FILE].
lamp:~#