groupmod(8)               System Management Commands               groupmod(8)

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       groupmod [options] GROUP

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       The groupmod command modifies the definition of the specified GROUP by
       modifying the appropriate entry in the group database.

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       The options which apply to the groupmod command are:

       -a, --append GID
           If group members are specified with -U, append them to the existing
           member list, rather than replacing it.

       -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.

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           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.

       -h, --help
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       -n, --new-name NEW_GROUP
           The name of the group will be changed from GROUP to NEW_GROUP name.

       -o, --non-unique
           When used with the -g option, allow to change the group GID to a
           non-unique value.

       -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.

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       -R, --root CHROOT_DIR
           Apply changes in the CHROOT_DIR directory and use the configuration
           files from the CHROOT_DIR directory. Only absolute paths are
           supported.

       -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.

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       The following configuration variables in /etc/login.defs change the
       behavior of this tool:

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       /etc/group
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       /etc/gshadow
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       /etc/login.defs
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       /etc/passwd
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       The groupmod command exits with the following values:

       0
           E_SUCCESS: success

       2
           E_USAGE: invalid command syntax

       3
           E_BAD_ARG: invalid argument to option

       4
           E_GID_IN_USE: group id already in use

       6
           E_NOTFOUND: specified group doesn't exist

       9
           E_NAME_IN_USE: group name already in use

       10
           E_GRP_UPDATE: can't update group file

       11
           E_CLEANUP_SERVICE: can't setup cleanup service

       12
           E_PAM_USERNAME: can't determine your username for use with pam

       13
           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 4.15.1               04/01/2024                       groupmod(8)