MAN page from OpenSuSE shadow-4.6-lp184.108.40.206.x86_64.rpm
Section: System Management Commands (8)
groupadd - create a new group
- groupadd [options] group
DESCRIPTIONThegroupaddcommand 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 thegroupaddcommand are:
- 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.-gis turned off).
-g, --gid GID
- The numerical value of the group's ID. This value must be unique, unless the-ooption is used. The value must be non-negative. The default is to use the smallest ID value greater than or equal toGID_MINand greater than every other group.
See also the-roption and theGID_MAXdescription.
- Display help message and exit.
-K, --key KEY=VALUE
- Overrides/etc/login.defsdefaults (GID_MIN, GID_MAX and others). Multiple-Koptions can be specified.
Example:-K GID_MIN=100 -K GID_MAX=499
Note:-K GID_MIN=10,GID_MAX=499doesn't work yet.
- This option permits to add a group with a non-unique GID.
-p, --password PASSWORD
- The encrypted password, as returned bycrypt(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.
- Create a system group.
The numeric identifiers of new system groups are chosen in theSYS_GID_MIN-SYS_GID_MAXrange, defined inlogin.defs, instead ofGID_MIN-GID_MAX.
-R, --root CHROOT_DIR
- Apply changes in theCHROOT_DIRdirectory and use the configuration files from theCHROOT_DIRdirectory.
-P, --prefix PREFIX_DIR
- Apply changes in thePREFIX_DIRdirectory and use the configuration files from thePREFIX_DIRdirectory. 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.
The following configuration variables in/etc/login.defschange the behavior of this tool:
GID_MAX (number), GID_MIN (number)
- Range of group IDs used for the creation of regular groups byuseradd,groupadd, ornewusers.
The default value forGID_MIN(resp.GID_MAX) is 1000 (resp. 60000).
- 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 byuseradd,groupadd, ornewusers.
The default value forSYS_GID_MIN(resp.SYS_GID_MAX) is 101 (resp.GID_MIN-1).
- Group account information.
- Secure group account information.
- 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,groupaddwill deny the group creation request.
Thegroupaddcommand exits with the following values:
- invalid command syntax
- invalid argument to option
- GID not unique (when-onot used)
- group name not unique
- can't update group file
- EXIT VALUES
- SEE ALSO
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