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Full Discussion: Unix File Permissions
Top Forums UNIX for Beginners Questions & Answers Answers to Frequently Asked Questions Tips and Tutorials Unix File Permissions Post 73755 by Perderabo on Friday 3rd of June 2005 07:20:56 PM
Old 06-03-2005
Set GID Bit on Directories

We briefly mentioned that files have a user and group associated with them. Originally, it was just the user and group of whoever created them. But originally, a user could be in only one group at a time. BSD introduced the concept that a user could be in multiple groups simutaneously. So in BSD, which group was used? BSD decided to use the group of the directory that contained the newly created file.

Many modern versions of unix try to have it both ways. A newly created file gets the group of the user unless the directory has the setgid bit. In that case, the newly created file gets the group of the directory.

And there is an exception to that! Changing the owner or group of a file has security concerns. For that reason, some versions of unix will, optionally, prohibit a user other than root from changing the owner of a file. Additionally, a user is prohibited from changing the group of a file unless he is a member of the new group. This restriction will override the setgid bit on a directory if needed.
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groups(1)						      General Commands Manual							 groups(1)

NAME
groups - Displays your group membership SYNOPSIS
groups [user] DESCRIPTION
The groups command writes to standard output the groups to which you or the specified user belong. The Tru64 UNIX operating system allows a user to belong to many different groups at the same time. Your primary group is specified in the /etc/passwd file. Once you are logged in, you can change your active group with the newgrp shell command (see sh). When you create a file, its group ID is that of your active group. Other groups that you belong to are specified in the /etc/group file. If you belong to more than one group, you can access files belonging to any of those groups without changing your primary group ID. These are called your concurrent groups. NOTES
The /etc/passwd and /etc/group files must be on the same node. EXAMPLES
To determine your group membership, enter: groups The groups to which you belong will be displayed. For example: devel prod FILES
Contains group information. Contains user information. SEE ALSO
Commands: csh(1), ksh(1), sh(1) Functions: initgroups(3), setgroups(2) groups(1)
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