system consistency check and interactive repair
[special | node ...]
command invokes file-system-specific
programs to check the special devices listed in the
file or on the command
line for consistency.
It is normally used in the script
during automatic reboot. If no
file systems are specified, fsck
reads the file
to determine which file
systems to check and in what order. Only partitions in fstab that are mounted
“rw” or “ro” and that have non-zero pass numbers
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, with one process spawned per disk drive. 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. By default, file systems which are already mounted
read/write are not checked.
The options are as follows:
- Causes fsck to use the
specified block as the location of the superblock. Block 32 is usually an
alternate super block. This option is only valid for filesystems that
support backup superblocks (ffs and ext2fs).
- Debugging mode. Just print the commands without executing
them. Available only if fsck is compiled to
- Force checking of file systems, even when they are marked
clean (for file systems that support this).
- Limit the number of parallel checks to
maxparallel. 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.
- When using
fstab(5), only check
filesystems that have the “net” mount option set. By default
file systems with this option are ignored.
- Assume a “no” response to all questions asked
by fsck except for “CONTINUE?”,
which is assumed to be affirmative. File systems will not be opened for
writing. This is the default for file systems to be checked that are
concurrently mounted writable.
- Enter preen mode: fsck will
check all file systems listed in
fstab(5) according to their
pass number, or any special devices listed on the command line, and will
make minor repairs without human intervention. Any major problems will
cause fsck to exit with a non-zero exit code,
so as to alert any invoking program or script that human intervention is
- List of comma separated file system specific options for
the specified file system type, in the same format as
- Invoke fsck only for the comma
separated list of file system types. If the list starts with
“no”, invoke fsck only in the
file system types that are not specified in
- Print the commands before executing them.
- Cause fsck to assume
“yes” as the answer to all operator questions.
If neither of the -y
options are specified, the user may force
to assume an answer of “yes”
to all the remaining questions by replying to a question with a value of
- file system table