Mac OS X in a Nutshell

Name

fsck

Synopsis

fsck [-l num_procs] [-b block_num] [-m mode] [-c { 0 | 1 | 2 | 
3 }] [-p | -n | 
-y] device
                  

Performs consistency checks of UFS volumes, and attempts to fix any inconsistencies found.

Options

-b

Specifies an alternate super block for the filesystem.

-c

Converts the filesystem to the specified version level. See the fsck manpage for details.

-l

Limits the number of parallel fsck processes. Defaults to the number of disks.

-m

Specifies the permissions of the lost+found directory, where files that have become detached from their place in the directory hierarchy due to filesystem corruption can be located. The argument is an octal mode, as described in the chmod manpage. The default is 1777.

-n

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

-p

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

-y

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

device

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