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Full Discussion: Can we add multiple groups to a directory or a file ?
Operating Systems AIX Can we add multiple groups to a directory or a file ? Post 302939700 by agent.kgb on Friday 27th of March 2015 05:33:36 PM
Old 03-27-2015
if you don't want to change anything, you receive nothing. there is a way without changing the ownership, but it is not the way you want, because it requires a little bit deeper understanding of AIX permission system and can cause some strange behaviour if it is applied without knowledge.

The way you want to go is to make one other group, say rwgroup. Users, who must have the right to write in the directory, receive this group as their secondary group. You change the owning group of the directory to rwgroup and set permissions to 2775. In this case all the users, who belong to rwgroup, can write to the directory. All the files they create in the directory will be created with rwgroup. All users, who don't belong to rwgroup, has read (list) access to the directory.

In this case you solve your task in a portable and clear for every administrator (and every tool) manner. If you choose another way, say allow 2 groups to write to one directory, it makes the solution unnecessary complex. After a year or two nobody will remember the solution and why it was done so. It will lead to wrong decisions and unsupportable environment. The main UNIX principle - keep it simple!
 

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LEARN ABOUT ULTRIX

group

group(5)							File Formats Manual							  group(5)

Name
       group - group file

Description
       The file is an ASCII file that contains the following information for each group:

       Group name
       Encrypted password
       Numerical group ID
       Comma-separated list of all users allowed in the group

       Each  group name is separated from the next by a new line.  The fields are separated by colons.	If the password field is null, no password
       is demanded.

       Because of the encrypted passwords, it can and does have general read permission and can be used, for example, to map numerical	group  IDs
       to names.

       The  database  can be distributed in a network by a naming service, such as Yellow Pages or BIND/Hesiod.  See the Guide to the Yellow Pages
       Service or the Guide to the BIND/Hesiod Service for setup information.

Restrictions
       The command will not change the passwords.

       Increasing the number of groups that a user is in beyond 8 can affect services that use SUN RPC.  The version of SUN RPC shipped with ULTRX
       V4.2  supports up to 32 groups.	Prior versions supported users being in up to 8 groups.  Users who increase the number of groups that they
       are a member of to more than 8 will not be able to NFS mount file systems from ULTRIX servers older than V4.2.  If root group membership is
       increased to more than 8 groups on a V4.2 system, the YP service may not work if that V4.2 system is in a mixed YP server environment where
       there are both V4.2 and previous releases of YP servers.  Again, this incompatibility can only occur if a user's or root's group membership
       is increased to more than 8 groups.

Files
See Also
       passwd(1), setgroups(2), crypt(3), getgrent(3), initgroups(3x), passwd(5)
       Guide to the BIND/Hesiod Service
       Guide to the Yellow Pages Service

																	  group(5)
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