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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | CONFIGURATION | FILES | CAVEATS | EXIT VALUES | SEE ALSO | COLOPHON |
GROUPADD(8) System Management Commands GROUPADD(8)
groupadd - create a new group
groupadd [options] group
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.
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 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.
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.
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).
/etc/group
Group account information.
/etc/gshadow
Secure group account information.
/etc/login.defs
Shadow password suite configuration.
Groupnames must start 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_-]*[$]?
Groupnames may only be up to 16 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.
The groupadd command exits with the following values:
0
success
2
invalid command syntax
3
invalid argument to option
4
GID not unique (when -o not used)
9
group name not unique
10
can't update group file
chfn(1), chsh(1), passwd(1), gpasswd(8), groupdel(8), groupmod(8),
login.defs(5), useradd(8), userdel(8), usermod(8).
This page is part of the shadow-utils (utilities for managing
accounts and shadow password files) project. Information about the
project can be found at ⟨http://pkg-shadow.alioth.debian.org/⟩. If
you have a bug report for this manual page, see
⟨http://pkg-shadow.alioth.debian.org/getinvolved.php⟩. This page was
obtained from the project's upstream Git repository
⟨git://anonscm.debian.org/git/pkg-shadow/shadow.git⟩ on 2017-07-05.
If you discover any rendering problems in this HTML version of the
page, or you believe there is a better or more up-to-date source for
the page, or you have corrections or improvements to the information
in this COLOPHON (which is not part of the original manual page),
send a mail to man-pages@man7.org
shadow-utils 4.4 07/05/2017 GROUPADD(8)
Pages that refer to this page: gpasswd(1), chgpasswd(8), groupdel(8), groupmems(8), groupmod(8), useradd(8), userdel(8), usermod(8)