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Full Discussion: is it possible to have a 1000 user in single group
Top Forums UNIX for Advanced & Expert Users is it possible to have a 1000 user in single group Post 302258656 by amitpansuria on Saturday 15th of November 2008 07:10:13 AM
Old 11-15-2008
Quote:
Originally Posted by jim mcnamara
I'm not sure what you are asking - /etc/group is supposed to be limited to LINE_MAX bytes per line. So LINE_MAX bytes can be used to describe users in the group. Check your man page.
Code:
getconf LINE_MAX

shows your system's value for this.

The record layout is:
Code:
group_name:passwd:GID:user_list

where user_list is a comma delimited list of user names in the group.

Where does 1000 come in? LINE_MAX and username length (plus a comma) are the limiting factors. 7000 bytes in a line and 5 character usernames (if allowed) will give 1000+.
We are adding 1000 users having secondary group. After adding 1000 users, Line of secondary group contains 7053 characters.

Is there any way to change LINE_MAX value of OS ???
Currently LINE_MAX value is 2048.

Thanks in advance...
 

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LEARN ABOUT SUSE

group

GROUP(5)						     Linux Programmer's Manual							  GROUP(5)

NAME

       group - user group file

DESCRIPTION

       /etc/group is a text file which defines the groups on the system.  There is one entry per line, with the following format:

	      group_name:password:GID:user_list

       The field descriptions are:

       group_name
	      the name of the group.

       password
	      the (encrypted) group password.  If this field is empty, no password is needed.

       GID    the numerical group ID.

       user_list
	      a list of the usernames that are members of this group, separated by commas.

FILES

       /etc/group

BUGS

       As the 4.2BSD initgroups(3) man page says: No-one seems to keep /etc/group up-to-date.

SEE ALSO

       login(1), newgrp(1), getgrent(3), getgrnam(3), passwd(5)

COLOPHON

       This  page is part of release 3.25 of the Linux man-pages project.  A description of the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2009-10-17								  GROUP(5)
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