FSCK(8) BSD System Manager's Manual FSCK(8)NAMEfsck - file system consistency check and interactive repair
SYNOPSISfsck [-dfnpvy] [-b block#] [-l maxparallel] [-T fstype:fsoptions]
[-t fstype] [special | node ...]
DESCRIPTION
The fsck command invokes file-system-specific programs to check the spe-
cial devices listed in the fstab(5) file or on the command line for con-
sistency.
It is normally used in the script rc(8) during automatic reboot. If no
file systems are specified, fsck reads the file fstab(5) 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 pre-
fix 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:
-b block#
Causes fsck to use the specified block as the location of the su-
perblock. Block 32 is usually an alternate super block. This op-
tion is only valid for filesystems that support backup super-
blocks (ffs and ext2fs).
-d Debugging mode. Just print the commands without executing them.
Available only if fsck is compiled to support it.
-f Force checking of file systems, even when they are marked clean
(for file systems that support this).
-l maxparallel
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.
-n 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 sys-
tems to be checked that are concurrently mounted writable.
-p 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 required.
-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", invoke fsck only in the file
system types that are not specified in the list.
-v Print the commands before executing them.
-y Cause fsck to assume "yes" as the answer to all operator ques-
tions.
If neither of the -y or -n options are specified, the user may force fsck
to assume an answer of "yes" to all the remaining questions by replying
to a question with a value of "F".
FILES
/etc/fstab file system table
SEE ALSOfs(5), fstab(5), fsck_ext2fs(8), fsck_ffs(8), fsck_msdos(8), fsdb(8),
growfs(8), mount(8), newfs(8), rc(8)MirOS BSD #10-current September 23, 1996 1
