newusers man page on Kali

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NEWUSERS(8)		  System Management Commands		   NEWUSERS(8)

NAME
       newusers - update and create new users in batch

SYNOPSIS
       newusers [options] [file]

DESCRIPTION
       The newusers command reads a file (or the standard input by default)
       and uses this information to update a set of existing users or to
       create new users. Each line is in the same format as the standard
       password file (see passwd(5)) with the exceptions explained below:

       pw_name:pw_passwd:pw_uid:pw_gid:pw_gecos:pw_dir:pw_shell

       pw_name
	   This is the name of the user.

	   It can be the name of a new user or the name of an existing user
	   (or a user created before by newusers). In case of an existing
	   user, the user's information will be changed, otherwise a new user
	   will be created.

       pw_passwd
	   This field will be encrypted and used as the new value of the
	   encrypted password.

       pw_uid
	   This field is used to define the UID of the user.

	   If the field is empty, a new (unused) UID will be defined
	   automatically by newusers.

	   If this field contains a number, this number will be used as the
	   UID.

	   If this field contains the name of an existing user (or the name of
	   a user created before by newusers), the UID of the specified user
	   will be used.

	   If the UID of an existing user is changed, the files ownership of
	   the user's file should be fixed manually.

       pw_gid
	   This field is used to define the primary group ID for the user.

	   If this field contains the name of an existing group (or a group
	   created before by newusers), the GID of this group will be used as
	   the primary group ID for the user.

	   If this field is a number, this number will be used as the primary
	   group ID of the user. If no groups exist with this GID, a new group
	   will be created with this GID, and the name of the user.

	   If this field is empty, a new group will be created with the name
	   of the user and a GID will be automatically defined by newusers to
	   be used as the primary group ID for the user and as the GID for the
	   new group.

	   If this field contains the name of a group which does not exist
	   (and was not created before by newusers), a new group will be
	   created with the specified name and a GID will be automatically
	   defined by newusers to be used as the primary group ID for the user
	   and GID for the new group.

       pw_gecos
	   This field is copied in the GECOS field of the user.

       pw_dir
	   This field is used to define the home directory of the user.

	   If this field does not specify an existing directory, the specified
	   directory is created, with ownership set to the user being created
	   or updated and its primary group.

	   If the home directory of an existing user is changed, newusers does
	   not move or copy the content of the old directory to the new
	   location. This should be done manually.

       pw_shell
	   This field defines the shell of the user. No checks are performed
	   on this field.

       newusers first tries to create or change all the specified users, and
       then write these changes to the user or group databases. If an error
       occurs (except in the final writes to the databases), no changes are
       committed to the databases.

       During this first pass, users are created with a locked password (and
       passwords are not changed for the users which are not created). A
       second pass is used to update the passwords using PAM. Failures to
       update a password are reported, but will not stop the other password
       updates.

       This command is intended to be used in a large system environment where
       many accounts are updated at a single time.

OPTIONS
       The options which apply to the newusers command are:

       -h, --help
	   Display help message and exit.

       -r, --system
	   Create a system account.

	   System users will be created with no aging information in
	   /etc/shadow, and their numeric identifiers are chosen in the
	   SYS_UID_MIN-SYS_UID_MAX range, defined in login.defs, instead of
	   UID_MIN-UID_MAX (and their GID counterparts for the creation of
	   groups).

       -R, --root CHROOT_DIR
	   Apply changes in the CHROOT_DIR directory and use the configuration
	   files from the CHROOT_DIR directory.

CAVEATS
       The input file must be protected since it contains unencrypted
       passwords.

CONFIGURATION
       The following configuration variables in /etc/login.defs change the
       behavior of this tool:

       GID_MAX (number), GID_MIN (number)
	   Range of group IDs used for the creation of regular groups by
	   useradd, groupadd, or newusers.

	   The default value for GID_MIN (resp.	 GID_MAX) is 1000 (resp.
	   60000).

       MAX_MEMBERS_PER_GROUP (number)
	   Maximum members per group entry. When the maximum is reached, a new
	   group entry (line) is started in /etc/group (with the same name,
	   same password, and same GID).

	   The default value is 0, meaning that there are no limits in the
	   number of members in a group.

	   This feature (split group) permits to limit the length of lines in
	   the group file. This is useful to make sure that lines for NIS
	   groups are not larger than 1024 characters.

	   If you need to enforce such limit, you can use 25.

	   Note: split groups may not be supported by all tools (even in the
	   Shadow toolsuite). You should not use this variable unless you
	   really need it.

       PASS_MAX_DAYS (number)
	   The maximum number of days a password may be used. If the password
	   is older than this, a password change will be forced. If not
	   specified, -1 will be assumed (which disables the restriction).

       PASS_MIN_DAYS (number)
	   The minimum number of days allowed between password changes. Any
	   password changes attempted sooner than this will be rejected. If
	   not specified, -1 will be assumed (which disables the restriction).

       PASS_WARN_AGE (number)
	   The number of days warning given before a password expires. A zero
	   means warning is given only upon the day of expiration, a negative
	   value means no warning is given. If not specified, no warning will
	   be provided.

       SUB_GID_MIN (number), SUB_GID_MAX (number), SUB_GID_COUNT (number)
	   If /etc/subuid exists, the commands useradd and newusers (unless
	   the user already have subordinate group IDs) allocate SUB_GID_COUNT
	   unused group IDs from the range SUB_GID_MIN to SUB_GID_MAX for each
	   new user.

	   The default values for SUB_GID_MIN, SUB_GID_MAX, SUB_GID_COUNT are
	   respectively 100000, 600100000 and 10000.

       SUB_UID_MIN (number), SUB_UID_MAX (number), SUB_UID_COUNT (number)
	   If /etc/subuid exists, the commands useradd and newusers (unless
	   the user already have subordinate user IDs) allocate SUB_UID_COUNT
	   unused user IDs from the range SUB_UID_MIN to SUB_UID_MAX for each
	   new user.

	   The default values for SUB_UID_MIN, SUB_UID_MAX, SUB_UID_COUNT are
	   respectively 100000, 600100000 and 10000.

       SYS_GID_MAX (number), SYS_GID_MIN (number)
	   Range of group IDs used for the creation of system groups by
	   useradd, groupadd, or newusers.

	   The default value for SYS_GID_MIN (resp.  SYS_GID_MAX) is 101
	   (resp.  GID_MIN-1).

       SYS_UID_MAX (number), SYS_UID_MIN (number)
	   Range of user IDs used for the creation of system users by useradd
	   or newusers.

	   The default value for SYS_UID_MIN (resp.  SYS_UID_MAX) is 101
	   (resp.  UID_MIN-1).

       UID_MAX (number), UID_MIN (number)
	   Range of user IDs used for the creation of regular users by useradd
	   or newusers.

	   The default value for UID_MIN (resp.	 UID_MAX) is 1000 (resp.
	   60000).

       UMASK (number)
	   The file mode creation mask is initialized to this value. If not
	   specified, the mask will be initialized to 022.

	   useradd and newusers use this mask to set the mode of the home
	   directory they create

	   It is also used by pam_umask as the default umask value.

FILES
       /etc/passwd
	   User account information.

       /etc/shadow
	   Secure user account information.

       /etc/group
	   Group account information.

       /etc/gshadow
	   Secure group account information.

       /etc/login.defs
	   Shadow password suite configuration.

       /etc/pam.d/newusers
	   PAM configuration for newusers.

       /etc/subgid
	   Per user subordinate group IDs.

       /etc/subuid
	   Per user subordinate user IDs.

SEE ALSO
       login.defs(5), passwd(1), subgid(5), subuid(5), useradd(8).

shadow-utils 4.5		  09/27/2017			   NEWUSERS(8)
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