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Top Forums UNIX for Advanced & Expert Users Cannot find logical file format for BSD file headers. Post 302957141 by Chris_top_he_r on Wednesday 7th of October 2015 12:02:00 PM
Old 10-07-2015
Thanks Jim. I was thinking it might be as difficult as you say. When I've posted the complete situation over the past few days, I get responses that suggest I should not want to know this or do this. As an enthusiast I like to explore and learn, so thought I would try to ask a much more direct technical question to avoid being scolded. :-)

Attached are several of my posts from a more thorough thread I started last week that might answer any questions you have. Sorry it is so long.

I've had these similar data errors on a MacBook 2006 10.6.8, a MacBook 2010 10.8.x, and a two week old MacBook Pro 10.10.5. The older ones have been cleaned up with install of OS. Because of our hack history here I was trying to learn more about this.
 

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repair_packages(8)					    BSD System Manager's Manual 					repair_packages(8)

NAME
repair_packages -- verify or repair filesystem permissions and flags for packages. SYNOPSIS
repair_packages [arguments] DESCRIPTION
repair_packages is used by Disk Utility to verify or repair permissions on installed packages. ARGUMENTS
--volume Perform all operations on the specified volume or home directory. The root volume '/' will be used if unspecified. --list-standard-pkgs Output the list of package-id strings corresponding to receipts in the installer's receipt database that will be verified or repaired by the --standard-pkgs flag. --verify Verify the specified package(s). --repair Repair the specified package(s). --pkg package-id Add the specified package to the list of packages to verify or repair. --standard-pkgs Add the standard packages to the list of packages to verify or repair. Use --list-standard-pkgs to view this list. --output-format # Use a special output format selected by #. Different output formats may be optimized for human or machine readability. The default output-format is '0', and is a verbose, human-readable format. NOTES
repair_packages only runs on 10.6 or later systems. To verify or repair permissions on earlier systems, reboot with a Tiger or Leopard system disk and verify or repair permissions with the repair_packages version on that disk. SEE ALSO
pkgutil(1) http://lists.apple.com/archives/installer-dev BUGS
repair_packages does not verify file contents or restore missing files; It can only verify or repair filesystem permissions. Mac OS June 2, 2019 Mac OS
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