fsck man page on NetBSD

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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 spe‐
     cial devices listed in the fstab(5) file or in the command line for con‐
     sistency.

     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 system) 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 par‐
     tition 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 sys‐
	     tems 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 ques‐
	     tions.

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
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