adduser.conf man page on ElementaryOS

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adduser.conf(5)						       adduser.conf(5)

NAME
       /etc/adduser.conf - configuration file for adduser(8) and addgroup(8).

DESCRIPTION
       The   file   /etc/adduser.conf	contains  defaults  for	 the  programs
       adduser(8) , addgroup(8) , deluser(8) and delgroup(8).  Each line holds
       a  single  value	 pair  in  the	form option = value.  Double or single
       quotes are allowed around the value, as is whitespace around the equals
       sign.  Comment lines must have a hash sign (#) in the first column.

       The valid configuration options are:

       DSHELL The  login  shell	 to  be	 used  for all new users.  Defaults to
	      /bin/bash.

       DHOME  The directory in which new home directories should  be  created.
	      Defaults to /home.

       GROUPHOMES
	      If  this	is set to yes, the home directories will be created as
	      /home/[groupname]/user.  Defaults to no.

       LETTERHOMES
	      If this is set to yes, then the home  directories	 created  will
	      have  an	extra  directory inserted which is the first letter of
	      the loginname.  For example: /home/u/user.  Defaults to no.

       SKEL   The directory  from  which  skeletal  user  configuration	 files
	      should be copied.	 Defaults to /etc/skel.

       FIRST_SYSTEM_UID and LAST_SYSTEM_UID
	      specify an inclusive range of UIDs from which system UIDs can be
	      dynamically allocated. Default to 100 - 999.  Please  note  that
	      system  software, such as the users allocated by the base-passwd
	      package, may assume that UIDs less than 100 are unallocated.

       FIRST_UID and LAST_UID
	      specify an inclusive range of UIDs from which normal user's UIDs
	      can be dynamically allocated. Default to 1000 - 29999.

       FIRST_SYSTEM_GID and LAST_SYSTEM_GID
	      specify an inclusive range of GIDs from which system GIDs can be
	      dynamically allocated.  Default to 100 - 999.

       FIRST_GID and LAST_GID
	      specify an inclusive range of GIDs  from	which  normal  group's
	      GIDs can be dynamically allocated. Default to 1000 - 29999.

       USERGROUPS
	      If  this	is  set	 to  yes, then each created user will be given
	      their own group to use.  If this is no, then each	 created  user
	      will  be placed in the group whose GID is USERS_GID (see below).
	      The default is yes.

       USERS_GID
	      If USERGROUPS is no, then USERS_GID is  the  GID	given  to  all
	      newly-created users.  The default value is 100.

       DIR_MODE
	      If  set to a valid value (e.g. 0755 or 755), directories created
	      will have the specified permissions as umask. Otherwise 0755  is
	      used as default.

       SETGID_HOME
	      If  this	is  set	 to  yes, then home directories for users with
	      their own group ( USERGROUPS=yes ) will have the setgid bit set.
	      This  was	 the  default  setting	for  adduser versions << 3.13.
	      Unfortunately it has some bad side effects, so we no  longer  do
	      this  per	 default.  If  you  want it nevertheless you can still
	      activate it here.

       QUOTAUSER
	      If set to a nonempty value, new users will  have	quotas	copied
	      from that user.  The default is empty.

       NAME_REGEX
	      User  and	 group	names are checked against this regular expres‐
	      sion. If the name doesn't match this regexp, user and group cre‐
	      ation  in adduser is refused unless --force-badname is set. With
	      --force-badname set, only weak checks are performed. The default
	      is  the  most  conservative ^[a-z][-a-z0-9]*$.  When --system is
	      specified, NAME_REGEX_SYSTEM is used instead.

       NAME_REGEX_SYSTEM
	      Names of system users are checked against this  regular  expres‐
	      sion.   If  --system is supplied and the name doesn't match this
	      regexp, user creation in adduser is refused unless  --force-bad‐
	      name is set. With --force-badname set, only weak checks are per‐
	      formed. The default is as for the default	 NAME_REGEX  but  also
	      allowing uppercase letters.

       SKEL_IGNORE_REGEX
	      Files  in	 /etc/skel/  are  checked  against this regex, and not
	      copied to the newly created home directory if they match.	  This
	      is  by default set to the regular expression matching files left
	      over from unmerged config files (dpkg-(old|new|dist)).

       ADD_EXTRA_GROUPS
	      Setting this to something other than 0 (the default) will	 cause
	      adduser  to  add	newly  created non-system users to the list of
	      groups defined by EXTRA_GROUPS (below).

       EXTRA_GROUPS
	      This is the list of groups that new  non-system  users  will  be
	      added  to.  By default, this list is 'dialout cdrom floppy audio
	      video plugdev users games'

NOTES
       VALID NAMES
	      adduser and addgroup enforce conformity to IEEE Std 1003.1-2001,
	      which  allows  only  the following characters to appear in group
	      and user names: letters, digits, underscores, periods, at	 signs
	      (@)  and dashes. The name may no start with a dash. The "$" sign
	      is allowed at the end of usernames (to conform to samba).

	      An additional check can be adjusted via the configuration param‐
	      eter NAME_REGEX to enforce a local policy.

FILES
       /etc/adduser.conf

SEE ALSO
       adduser(8), addgroup(8), deluser(8), delgroup(8), deluser.conf(5)

Debian GNU/Linux	   Version 3.113+nmu3ubuntu3	       adduser.conf(5)
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