plan9 man page for groupmod

groupmod(1M)						  System Administration Commands					      groupmod(1M)

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
		<param.h>. The group ID defaults to the next available (unique) number above 99. (Group IDs from 0-99 are reserved  by	SunOS  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 Solaris 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 (
).

       -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

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO
       users(1B), groupadd(1M), groupdel(1M), logins(1M), useradd(1M), userdel(1M), usermod(1M), group(4), attributes(5)

NOTES
       The groupmod utility only modifies group definitions in the /etc/group file. If a network name service such as NIS or NIS+ 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.

SunOS 5.10							    5 Dec 1995							      groupmod(1M)