Mac OS X in a Nutshell

Name

fsck_hfs

Synopsis

fsck_hfs -u
fsck_hfs [-d] [ -r] {-q | -p | [-n | -y]} device
                  

Performs a consistency check of HFS and HFS+ volumes, and attempts to fix any inconsistencies found.

Options

-d

Enables debugging output.

-f

Forces check even if the volume is marked as clean.

-n

Automatically answers “no” whenever fsck_hfs asks to resolve an inconsistency.

-p

Runs in preening mode, in which only purely innocuous inconsistencies are resolved.

-q

Checks the filesystem but does not resolve any inconsistencies. Returns filesystem status of clean, dirty, or failure to standard error.

-r

Causes a rebuild of the volume’s catalog btree to occur.

-u

Prints a usage statement to standard output.

-y

Automatically answers “yes” whenever fsck_hfs asks to resolve an inconsistency.

device

The volume’s device filename, e.g., /dev/disk1s2.