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When creating files and directories within a parent directory it is often useful to match the group-ownership of the new files or directories to the parent directory's owner or group automatically. This is key to the operation of the [[Project layout|Project]] filesystems at Graham and Cedar, for example, since storage quotas in Project spaces are enforced by group. | When creating files and directories within a parent directory it is often useful to match the group-ownership of the new files or directories to the parent directory's owner or group automatically. This is key to the operation of the [[Project layout|Project]] filesystems at Graham and Cedar, for example, since storage quotas in Project spaces are enforced by group. | ||
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If Set Group ID (SGID) permission is turned on for a directory, new files and directories in that directory will be created with the same group-ownership as the directory. To illustrate the use of SGID let us walk through an example. | If Set Group ID (SGID) permission is turned on for a directory, new files and directories in that directory will be created with the same group-ownership as the directory. To illustrate the use of SGID let us walk through an example. | ||