fsck.hfs(8)
NAME
fsck.hfs --- HFS file system consistency check
SYNOPSIS
fsck.hfs -q [-df] special ...
fsck.hfs -p [-df] special ...
fsck.hfs [-n | -y | -r] [-dfgl] [-m mode] [-c size] special ...
DESCRIPTION
The fsck.hfs utility verifies and repairs standard HFS and HFS+ file
systems.
The first form of fsck.hfs quickly checks the specified file systems to
determine whether they were cleanly unmounted.
The second form of fsck.hfs preens the specified file systems. It is
normally started by fsck(8) during systen boot, when a HFS file system is
detected. When preening file systems, fsck.hfs will fix common
inconsistencies for file systems that were not unmounted cleanly. If
more serious problems are found, fsck.hfs does not try to fix them,
indicates that it was not successful, and exits.
The third form of fsck.hfs checks the specified file systems and tries to
repair all detected inconsistencies.
If no options are specified fsck.hfs will always check and attempt to fix
the specified file systems.
The options are as follows:
-c size Specify the size of the cache used by fsck.hfs internally.
Bigger size can result in better performance but can result
in deadlock when used with -l option. Size can be
specified as a decimal, octal, or hexadecimal number. If
the number ends with a ``k'', ``m'', or ``g'', the number
is multiplied by 1024 (1K), 1048576 (1M), or 1073741824
(1G), respectively.
-d Display debugging information. This option may provide
useful information when fsck.hfs cannot repair a damaged
file system.
-f When used with the -p option, force fsck.hfs to check
`clean' file systems, otherwise it means force fsck.hfs to
check and repair journaled HFS+ file systems.
-g Causes fsck.hfs to generate its output strings in GUI
format. This option is used when another application with
a graphical user interface (like Mac OS X Disk Utility) is
invoking the fsck.hfs tool.
-l Lock down the file system and perform a test-only check.
This makes it possible to check a file system that is
currently mounted, although no repairs can be made.
-m mode Mode is an octal number that will be used to set the
permissions for the lost+found directory when it is
created. The lost+found directory is only created when a
volume is repaired and orphaned files or directories are
detected. fsck.hfs places orphaned files and directories
into the lost+found directory (located at the root of the
volume). The default mode is 01777.
-p Preen the specified file systems.
-q Causes fsck.hfs to quickly check whether the volume was
unmounted cleanly. If the volume was unmounted cleanly,
then the exit status is 0. If the volume was not unmounted
cleanly, then the exit status will be non-zero. In either
case, a message is printed to standard output describing
whether the volume was clean or dirty.
-y Always attempt to repair any damage that is found.
-n Never attempt to repair any damage that is found.
-r Rebuild the catalog file on the specified file system.
This option currently will only work if there is enough
contiguous space on the specified file system for a new
catalog file and if there is no damage to the leaf nodes in
the existing catalog file.
SEE ALSO
fsck(8)
BUGS
fsck.hfs is not able to fix some inconsistencies that it detects.
HISTORY
The fsck.hfs command appeared in Mac OS X Server 1.0 .
Opportunity
Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.
Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.
Free Software
Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.
Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.
Free Books
The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.
Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.
Education
Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.
Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.
