fsck(8) - NetBSD Manual Pages

Command: Section: Arch: Collection:  
FSCK(8)                 NetBSD System Manager's Manual                 FSCK(8)

fsck -- file system consistency check and interactive repair
fsck [-dfnPpqvy] [-l maxparallel] [-T fstype:fsoptions] [-t fstype] [-x mountpoint] [special | node ...]
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 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 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 file systems. -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 file system 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.
/etc/fstab file system table
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 file system. Re-running fsck on the file system(s) is required. 4 The root file system was changed in the process of checking, and updating the mount was unsuccessful. A reboot (without sync) is required. 8 The file system 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).
fstab(5), fsck_ext2fs(8), fsck_ffs(8), fsck_lfs(8), fsck_msdos(8), mount(8)
An fsck utility appeared in 4.0BSD. It was reimplemented as a file sys- tem independent wrapper in NetBSD 1.3. The original file system specific utility became fsck_ffs(8) at this point. NetBSD 10.99 April 18, 2020 NetBSD 10.99
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