fsck - check and repair file systems
fsck [-F FSType] [-m] [-V] [-v] [special]...
fsck [-F FSType] [-n | N | y | Y] [-V] [-v] [-o FSType-specific-options] [special]...
fsck audits and interactively repairs inconsistent file system conditions. If the file system is inconsistent the default action for each correction is to wait for the user to respond yes or no. If the user does not have write permission fsck defaults to a no action. Some corrective actions will result in loss of data. The amount and severity of data loss can be determined from the diagnostic output.
FSType-specific-options are options specified in a comma-separated (with no intervening spaces) list of options or keyword-attribute pairs for interpretation by the FSType-specific module of the command.
special represents the character special device on which the file system resides, for example, /dev/rdsk/c1t0d0s7. Note: the character special device, not the block special device, should be used. fsck will not work if the block device is mounted.
If no special device is specified fsck checks the file systems listed in /etc/vfstab. Those entries in /etc/vfstab which have a character special device entry in the fsckdev field and have a non-zero numeric entry in the fsckpass field will be checked. Specifying -F FSType limits the file systems to be checked to those of the type indicated.
If special is specified, but -F is not, the file system type will be determined by looking for a matching entry in /etc/vfstab. If no entry is found, the default local file system type specified in /etc/default/fs will be used.
If a file system type supports parallel checking, for example, ufs, some file systems eligible for checking may be checked in parallel. Consult the file system-specific man page (for example, fsck_ufs(1M)) for more information.
The following generic options are supported:
ufs fsck: sanity check: /dev/rdsk/c0t3d0s1 okay
-n | -N
-y | Y
The fsck command is large file aware for UFS file systems, per the largefile(5) man page.
See attributes(5) for descriptions of the following attributes:
clri(1M), fsck_cachefs(1M), fsck_ufs(1M), fsdb_ufs(1M), fsirand(1M), fstyp(1M), mkfs(1M), mkfs_ufs(1M), mountall(1M), newfs(1M), reboot( 1M), vfstab(4), attributes(5), largefile(5), ufs(7FS)
The operating system buffers file system data. Running fsck on a mounted file system can cause the operating system's buffers to become out of date with respect to the disk. For this reason, the file system should be unmounted when fsck is used. If this is not possible, care should be taken that the system is quiescent and that it is rebooted immediately after fsck is run. Quite often, however, this will not be sufficient. A panic will probably occur if running fsck on a file system modifies the file system.
This command may not be supported for all FSTypes.
Starting with Solaris 9, fsck manages extended attribute data on the disk. (See fsattr(5) for a description of extended file attributes.) A file system with extended attributes can be mounted on versions of Solaris that are not attribute-aware (versions prior to Solaris 9), but the attributes will not be accessible and fsck will strip them from the files and place them in lost+found. Once the attributes have been stripped, the file system is completely stable on versions of Solaris that are not attribute-aware, but would be considered corrupted on attribute-aware versions. In the latter circumstance, run the attribute-aware fsck to stabilize the file system before using it in an attribute-aware environment.
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Created 1996-2021 by Maxim Chirkov
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