Repairing disk permissions is a troubleshooting activity commonly associated with the Mac OS X operating system. The efficacy of repairing permissions to troubleshoot application errors has been debated.
The BSD layer in Mac OS X (and Darwin) is responsible for file-
Repairing permissions involves checking the permissions of a set of files and folders on a volume with Mac OS X installed against a list of correct POSIX permissions and correcting any discrepancies. The list of correct permissions is compiled by consulting the various bill-
Files whose permissions have been incorrectly altered by an administrator, an administrator operating with root privileges, or a poorly-
A permission repair can be performed using Disk Utility (/Applications/Utilities/Disk Utility.app) by selecting a Mac OS X startup volume and clicking the Repair Disk Permissions in the First Aid section. A verification procedure, which will only check permissions, but not perform repairs, is also available. Both operations can be performed by using the diskutil command-
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