GROUPADD(8)               (02/07/2020)                GROUPADD(8)

     NAME
          groupadd - create a new group

     SYNOPSIS
          groupadd [options] group

     DESCRIPTION
          The groupadd command creates a new group account using the
          values specified on the command line plus the default values
          from the system. The new group will be entered into the
          system files as needed.

     OPTIONS
          The options which apply to the groupadd command are:

          -f, --force
              This option causes the command to simply exit with
              success status if the specified group already exists.
              When used with -g, and the specified GID already exists,
              another (unique) GID is chosen (i.e.  -g is turned off).

          -g, --gid GID
              The numerical value of the group's ID. This value must
              be unique, unless the -o option is used. The value must
              be non-negative. The default is to use the smallest ID
              value greater than or equal to GID_MIN and greater than
              every other group.

              See also the -r option and the GID_MAX description.

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

          -K, --key KEY=VALUE
              Overrides /etc/login.defs defaults (GID_MIN, GID_MAX and
              others). Multiple -K options can be specified.

              Example: -K GID_MIN=100  -K GID_MAX=499

              Note: -K GID_MIN=10,GID_MAX=499 doesn't work yet.

          -o, --non-unique
              This option permits to add a group with a non-unique
              GID.

          -p, --password PASSWORD
              The encrypted password, as returned by crypt(3). The
              default is to disable the password.

              Note: This option is not recommended because the

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              password (or encrypted password) will be visible by
              users listing the processes.

              You should make sure the password respects the system's
              password policy.

          -r, --system
              Create a system group.

              The numeric identifiers of new system groups are chosen
              in the SYS_GID_MIN-SYS_GID_MAX range, defined in
              login.defs, instead of GID_MIN-GID_MAX.

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

          -P, --prefix PREFIX_DIR
              Apply changes in the PREFIX_DIR directory and use the
              configuration files from the PREFIX_DIR directory. This
              option does not chroot and is intended for preparing a
              cross-compilation target. Some limitations: NIS and LDAP
              users/groups are not verified. PAM authentication is
              using the host files. No SELINUX support.

     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.

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              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.

          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).

     FILES
          /etc/group
              Group account information.

          /etc/gshadow
              Secure group account information.

          /etc/login.defs
              Shadow password suite configuration.

     CAVEATS
          It is usually recommended to only use groupnames that begin
          with a lower case letter or an underscore, followed by lower
          case letters, digits, underscores, or dashes. They can end
          with a dollar sign. In regular expression terms:
          [a-z_][a-z0-9_-]*[$]?

          On Debian, the only constraints are that groupnames must
          neither start with a dash ('-') nor plus ('+') nor tilde
          ('~') nor contain a colon (':'), a comma (','), or a
          whitespace (space:' ', end of line: '\n', tabulation: '\t',
          etc.).

          Groupnames may only be up to 32 characters long.

          You may not add a NIS or LDAP group. This must be performed
          on the corresponding server.

          If the groupname already exists in an external group
          database such as NIS or LDAP, groupadd will deny the group
          creation request.

     EXIT VALUES
          The groupadd command exits with the following values:

          0
              success

          2
              invalid command syntax

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          3
              invalid argument to option

          4
              GID not unique (when -o not used)

          9
              group name not unique

          10
              can't update group file

     SEE ALSO
          chfn(1), chsh(1), passwd(1), gpasswd(8), groupdel(8),
          groupmod(8), login.defs(5), useradd(8), userdel(8),
          usermod(8).

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