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. -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. -U, --users A list of usernames to add as members of the group. The default behavior (if the -g, -N, and -U options are not specified) is defined by the USERGROUPS_ENAB variable in /etc/login.defs.
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 ⟨https://github.com/shadow-maint/shadow⟩. If you have a bug report for this manual page, send it to firstname.lastname@example.org. This page was obtained from the project's upstream Git repository ⟨https://github.com/shadow-maint/shadow⟩ on 2020-12-18. (At that time, the date of the most recent commit that was found in the repository was 2020-11-08.) 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 email@example.com shadow-utils 4.8.1 12/18/2020 GROUPADD(8)
Pages that refer to this page: gpasswd(1), homectl(1), chgpasswd(8), groupdel(8), groupmems(8), groupmod(8), useradd(8), userdel(8), usermod(8)