10-07-2015
Cannot find logical file format for BSD file headers.
Hi. Unix rookie here. Been looking for a few days for reference documents on how BSD UNIX lays the logical file format onto a disk. Goal is to view/edit with hex editor for data repair. Lots of docs are available for how to use Unix commands (like xxd), but I want to learn the map of how Unix stores the file header and file data and cluster information on the hard disk. I've asked on a few forums and emailed companies (like R-tt regarding R-Studio for Mac) and have no answer yet. Anyone know where I can read about this?
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LEARN ABOUT OSX
repair_packages
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