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Top Forums UNIX for Dummies Questions & Answers user control- supplementary group Post 302521951 by Corona688 on Thursday 12th of May 2011 11:56:18 PM
Old 05-13-2011
You agreed not to bump posts when you registered here. If you don't get an answer immediately, wait -- nobody here is "on call".

Supplementary groups are extra groups a user belongs to, as stored in /etc/passwd. Users also have one and only one primary group. It's a bit redundant; I think it's for historical reasons.

You create a group with groupadd groupname.

You assign supplementary groups to a user with usermod -G group1,group2,... username Beware that this replaces their supplementary groups, not adds to them. Most Linux supports the -a flag though, which lets you add to their list of groups instead.
 

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squid_unix_group(8)					      System Manager's Manual					       squid_unix_group(8)

NAME
squid_unix_group - Squid UNIX Group external_acl helper SYNOPSIS
squid_unix_group [-g groupname] [-g groupname...] [-p] [-s] DESCRIPTION
This helper allows Squid to base access controls on users memberships in UNIX groups. -g groupname Specifies a group name to match. -p Also match the users primary group from /etc/passwd -s Strip NT domain name component from user names (/ or separated) EXAMPLES
This squid.conf example defines two Squid acls. usergroup1 matches users in group1, and usergroup2 matches users in group2 or group3 external_acl_type unix_group %LOGIN /usr/local/squid/libexec/squid_unix_group -p acl usergroup1 external unix_group group1 acl usergroup2 external unix_group group2 group3 NOTES
By default up to 11 groups can be matched in one acl (including commandline specified groups). This limit is defined by MAX_GROUPS in the source code. AUTHOR
This manual page was written by Henrik Nordstrom <hno@squid-cache.org> squid_unix_group is written by Rodrigo Campos <rodrigo@geekbunker.org> KNOWN ISSUES
Does not understand gid aliased groups sometimes used to work around groups size limitations. If you are using gid aliased groups then you must specify each alias by name. QUESTIONS
Any questions on usage can be sent to Squid Users <squid-users@squid-cache.org> REPORTING BUGS
Report bugs or bug-fixes to Rodrigo Campos <rodrigo@geekbunker.org> or Squid Developers <squid-dev@squid-cache.org> SEE ALSO
group(5),passwd(5) Squid UNIX Group helper 12 August 2002 squid_unix_group(8)
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