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B<addgroup> --system [options] [--gid ID] group

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B<adduser> [options] user group

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DESCRIPTION

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B<adduser> and B<addgroup> add users and groups to the system according to command line options and configuration information in I</etc/adduser.conf>. They are friendlier front ends to the low level tools like B<useradd,> B<groupadd> and B<usermod> programs, by default choosing Debian policy conformant UID and GID values, creating a home directory with skeletal configuration, running a custom script, and other features. B<adduser> and B<addgroup> can be run in one of five modes:

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Add a normal user

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If called with one non-option argument and without the B<--system> or B<--group> options, B<adduser> will add a normal user.

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B<adduser> will choose the first available UID from the range specified for normal users in the configuration file. The UID can be overridden with the B<--uid> option.

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The range specified in the configuration file may be overridden with the B<--firstuid> and B<--lastuid> options.

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By default, each user in Debian GNU/Linux is given a corresponding group with the same name. Usergroups allow group writable directories to be easily maintained by placing the appropriate users in the new group, setting the set-group-ID bit in the directory, and ensuring that all users use a umask of 002. If this option is turned off by setting B<USERGROUPS> to I<no>, all users' GIDs are set to B<USERS_GID>. Users' primary groups can also be overridden from the command line with the B<--gid> or B<--ingroup> options to set the group by id or name, respectively. Also, users can be added to one or more groups defined in adduser.conf either by setting ADD_EXTRA_GROUPS to 1 in adduser.conf, or by passing B<--add_extra_groups> on the commandline.

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B<adduser> will create a home directory subject to B<DHOME>, B<GROUPHOMES>, and B<LETTERHOMES>. The home directory can be overridden from the command line with the B<--home> option, and the shell with the B<--shell> option. The home directory's set-group-ID bit is set if B<USERGROUPS> is I<yes> so that any files created in the user's home directory will have the correct group.