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)