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Top Forums UNIX for Advanced & Expert Users is it possible to have a 1000 user in single group Post 302257832 by methyl on Thursday 13th of November 2008 06:58:38 AM
Old 11-13-2008
There is no limit on the number of users in a primary group. The limit of LINE_MAX applies to each secondary group. It is not necessary or advisible to list any users primary group in /etc/group .
Though not tried on Red Hat, I have seen multiple lines for the same group in /etc/group in a very large unix SVR4 system.
 

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listusers(1)						      General Commands Manual						      listusers(1)

NAME
listusers - display user login data SYNOPSIS
groups] logins] DESCRIPTION
The command displays data concerning user logins. The output shows the user login and the comment field value (for example, user name, location). The default displays data about all user logins. Options The command supports the following options: Display only users who have groups, as their primary group. Use with the option. Display only users who have groups, as their supplementary group. Use with the option. Display all users belonging to groups, sorted by login. A comma separated list specifies multiple groups. Display the requested logins. A comma separated list specifies multiple logins. Display only users belonging to the specified repository, either for NIS or users. A user login has a UID of 100 or greater. When the and options are combined, a user login is only displayed once, even though the login may belong to multiple specified groups. EXAMPLES
List all user logins. List all user logins in the group and the users removing all duplicates. List all users who have as their primary group. List all users who have as their supplementary group. List only local user logins. List only NIS user logins. FILES
SEE ALSO
passwd(1), logins(1M), group(4), passwd(4). STANDARDS CONFORMANCE
listusers(1)
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