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

NAME

     fsck -- file system consistency check and interactive repair

SYNOPSIS

     fsck [-dfnPpqvy] [-l maxparallel] [-T fstype:fsoptions] [-t fstype] [-x mountpoint] [special | node ...]

DESCRIPTION

     The fsck command invokes file system-specific programs to check the special devices listed in the fstab(5) file or in the command line for
     consistency.

     It is normally used in the script /etc/rc during automatic reboot.  If no file systems are specified, and ``preen'' mode is enabled ( -p
     option) fsck reads the table /etc/fstab to determine which file systems to check, in what order.  Only partitions in fstab that are mounted
     ``rw,'' ``rq'' or ``ro'' and that have non-zero pass number are checked.  File systems with pass number 1 (normally just the root file sys-
     tem) are checked one at a time.  When pass 1 completes, all remaining file systems are checked, running one process per disk drive.  By
     default, file systems which are already mounted read-write are not checked.  The disk drive containing each file system is inferred from the
     longest prefix of the device name that ends in a digit; the remaining characters are assumed to be the partition designator.

     The options are as follows:

     -d      Debugging mode.  Just print the commands without executing them.

     -f      Force checking of file systems, even when they are marked clean (for file systems that support this), or when they are mounted read-
	     write.

     -l maxparallel
	     Limit the number of parallel checks to the number specified in the following argument.  By default, the limit is the number of disks,
	     running one process per disk.  If a smaller limit is given, the disks are checked round-robin, one file system at a time.

     -n      Causes fsck to assume no as the answer to all operator questions, except "CONTINUE?".

     -P      Display a progress meter for each file system check.  This option also disables parallel checking.  Note that progress meters are not
	     supported by all file system types.

     -p      Enter preen mode.	In preen mode, fsck will check all file systems listed in /etc/fstab according to their pass number, and will make
	     minor repairs without human intervention.

     -q      Quiet mode, do not output any messages for clean filesystems.

     -T fstype:fsoptions
	     List of comma separated file system specific options for the specified file system type, in the same format as mount(8).

     -t fstype
	     Invoke fsck only for the comma separated list of file system types.  If the list starts with ``no'' then invoke fsck for the file
	     system types that are not specified in the list.

     -v      Print the commands before executing them.

     -x mountpoint
	     Exclude the filesystem which has a mountpoint the same as in /etc/fstab.  Used only in ``preen'' mode.

     -y      Causes fsck to assume yes as the answer to all operator questions.

FILES

     /etc/fstab  file system table

EXIT STATUS

     fsck exits with 0 on success.  Any major problems will cause fsck to exit with the following non-zero exit(3) codes, so as to alert any
     invoking program or script that human intervention is required.

     1	   Usage problem.

     2	   Unresolved errors while checking the filesystem.  Re-running fsck on the filesystem(s) is required.

     4	   The root filesystem was changed in the process of checking, and updating the mount was unsuccessful.  A reboot (without sync) is
	   required.

     8	   The filesystem check has failed, and a subsequent check is required that will require human intervention.

     12    fsck exited because of the result of a signal (usually SIGINT or SIGQUIT from the terminal).

SEE ALSO

     fstab(5), fsck_ext2fs(8), fsck_ffs(8), fsck_lfs(8), fsck_msdos(8), mount(8)

BSD
								 February 17, 2010							       BSD