adduser man page

gistfile1.txt

ADDUSER(8)                                                                                                                                                           ADDUSER(8)

NAME
       adduser, addgroup - add a user or group to the system

SYNOPSIS
       adduser  [options]  [--home DIR] [--shell SHELL] [--no-create-home] [--uid ID] [--firstuid ID] [--lastuid ID] [--ingroup GROUP | --gid ID] [--disabled-password] [--dis‐
       abled-login] [--gecos GECOS] [--add_extra_groups] [--encrypt-home] user

       adduser --system [options] [--home DIR] [--shell SHELL] [--no-create-home] [--uid ID] [--group | --ingroup GROUP | --gid  ID]  [--disabled-password]  [--disabled-login]
       [--gecos GECOS] user

       addgroup [options] [--gid ID] group

       addgroup --system [options] [--gid ID] group

       adduser [options] user group

   COMMON OPTIONS
       [--quiet] [--debug] [--force-badname] [--help|-h] [--version] [--conf FILE]



DESCRIPTION
       adduser and addgroup add users and groups to the system according to command line options and configuration information in /etc/adduser.conf.  They are friendlier front
       ends to the low level tools like useradd, groupadd and 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.  adduser and addgroup can be run in one of five modes:

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

       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 --uid option.

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

       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 USERGROUPS to no, all users' GIDs are set to USERS_GID.  Users' primary groups can also be overridden from the command line with the --gid or --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 --add_extra_groups on the commandline.

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

      adduser  will copy files from SKEL into the home directory and prompt for finger (gecos) information and a password.  The gecos may also be set with the --gecos option.
       With the --disabled-login option, the account will be created but will be disabled until a password is set. The --disabled-password option will not set a password,  but
       login  is still possible (for example with SSH RSA keys).  To set up an encrypted home directory for the new user, add the --encrypt-home option.  For more information,
       refer to the -b option of ecryptfs-setup-private(1).

       If the file /usr/local/sbin/adduser.local exists, it will be executed after the user account has been set up in order to do any local setup.  The  arguments  passed  to
       adduser.local are:
       username uid gid home-directory
       The environment variable VERBOSE is set according to the following rule:

       0 if --quiet is specified

       1 if neither --quiet nor --debug is specified

       2 if --debug is specified

              (The same applies to the variable DEBUG, but DEBUG is deprecated and will be removed in a later version of adduser.)


   Add a system group
       If addgroup is called with the --system option, a system group will be added.

       A GID will be chosen from the range specified for system GIDS in the configuration file (FIRST_SYSTEM_GID, LAST_SYSTEM_GID). To override that mechanism you can give the
       GID using the --gid option.

       The group is created with no users.

   Add an existing user to an existing group
       If called with two non-option arguments, adduser will add an existing user to an existing group.