
Appendix B ACL Permissions and Group Memberships Using GUID 215
SIDs and Windows Interoperability
Security identifiers (SIDs) for Windows systems have similar functions to GUIDs on Mac
OS X systems. Every time Mac OS X assigns a GUID to a process or a file, a SID is
assigned as well. This allows Mac OS X systems to work seamlessly across Windows
systems.
Importing and Exporting Users
Having an export file that contains a GUID for every user and group enables you to
quickly restore users and groups with file permissions and group memberships
unchanged. The GUID attribute is automatically included when you export user records
from Workgroup Manager or the command line in Mac OS X Server version 10.4.
If you lose user accounts and create new accounts with the same UID, GID, and short
names as the lost accounts, the replacement accounts will have new GUIDs assigned. A
user’s new GUID won’t match the previous GUID, so the user won’t retain prior ACL
permissions or group memberships. Similarly, If you import users or groups from a file
that doesn’t include the GUID attribute, Mac OS X Server will assign new GUIDs to
every imported user and group.
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