GROUPMOD(8) System Management Commands GROUPMOD(8)
groupmod - modify a group definition on the system
groupmod [options] GROUP
The groupmod command modifies the definition of the specified GROUP by
modifying the appropriate entry in the group database.
The options which apply to the groupmod command are:
-g, --gid GID
The group ID of the given GROUP will be changed to GID.
The value of GID must be a non-negative decimal integer. This value
must be unique, unless the -o option is used.
Users who use the group as primary group will be updated to keep
the group as their primary group.
Any files that have the old group ID and must continue to belong to
GROUP, must have their group ID changed manually.
No checks will be performed with regard to the GID_MIN, GID_MAX,
SYS_GID_MIN, or SYS_GID_MAX from /etc/login.defs.
Display help message and exit.
-n, --new-name NEW_GROUP
The name of the group will be changed from GROUP to NEW_GROUP name.
When used with the -g option, allow to change the group GID to a
-p, --password PASSWORD
The encrypted password, as returned by crypt(3).
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
-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.
The following configuration variables in /etc/login.defs change the
behavior of this tool:
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.
Group account information.
Secure group account information.
Shadow password suite configuration.
User account information.
The groupmod command exits with the following values:
E_USAGE: invalid command syntax
E_BAD_ARG: invalid argument to option
E_GID_IN_USE: specified group doesn't exist
E_NOTFOUND: specified group doesn't exist
E_NAME_IN_USE: group name already in use
E_GRP_UPDATE: can't update group file
E_CLEANUP_SERVICE: can't setup cleanup service
E_PAM_USERNAME: can't determine your username for use with pam
E_PAM_ERROR: pam returned an error, see syslog facility id groupmod
for the PAM error message
chfn(1), chsh(1), passwd(1), gpasswd(8), groupadd(8), groupdel(8),
login.defs(5), useradd(8), userdel(8), usermod(8).
shadow-utils 4.8.1 11/29/2022 GROUPMOD(8)
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