GROUPMOD(8) Maintenance Commands and Procedures GROUPMOD(8)

NAME

groupmod - modify a group definition on the system

SYNOPSIS

/usr/sbin/groupmod [-g gid [-o]] [-n name] group

DESCRIPTION

The groupmod command modifies the definition of the specified group
by modifying the appropriate entry in the /etc/group file.

OPTIONS

The following options are supported:

-g gid
Specify the new group ID for the group. This group ID must
be a non-negative decimal integer less than MAXUID, as
defined in <sys/param.h>. The group ID defaults to the
next available (unique) number above 99. (Group IDs from
0-99 are reserved for future applications.)


-n name
Specify the new name for the group. The name argument is
a string of no more than eight bytes consisting of
characters from the set of lower case alphabetic
characters and numeric characters. A warning message will
be written if these restrictions are not met. A future
release may refuse to accept group fields that do not meet
these requirements. The name argument must contain at
least one character and must not include a colon (:) or
NEWLINE (\n).


-o
Allow the gid to be duplicated (non-unique).

OPERANDS

The following operands are supported:

group
An existing group name to be modified.

EXIT STATUS

The groupmod utility exits with one of the following values:

0
Success.


2
Invalid command syntax. A usage message for the groupmod
command is displayed.


3
An invalid argument was provided to an option.


4
gid is not unique (when the -o option is not used).


6
group does not exist.


9
name already exists as a group name.


10
Cannot update the /etc/group file.

FILES

/etc/group
group file

SEE ALSO

group(5), attributes(7), groupadd(8), groupdel(8), logins(8),
useradd(8), userdel(8), usermod(8)

NOTES

The groupmod utility only modifies group definitions in the
/etc/group file. If a network name service is being used to
supplement the local /etc/group file with additional entries,
groupmod cannot change information supplied by the network name
service. The groupmod utility will, however, verify the uniqueness of
group name and group ID against the external name service.


groupmod fails if a group entry (a single line in /etc/group) exceeds
2047 characters.

January 7, 2018 GROUPMOD(8)