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System Administration Commands                                        fsck(1M)

       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 condi‐
       tions. 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  cor‐
       rective 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  sys‐
       tem  resides, for example, /dev/rdsk/c1t0d0s7. Note: the character spe‐
       cial 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  lim‐
       its 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:

       -F FSType

           Specify the file system type on which to operate.


           Check but do not repair. This option checks that the file system is
           suitable for mounting, returning the appropriate  exit  status.  If
           the file system is ready for mounting, fsck displays a message such

             ufs fsck: sanity check: /dev/rdsk/c0t3d0s1 okay

       -n | -N

           Assume a no response to all questions asked by fsck;  do  not  open
           the file system for writing.


           Echo the expanded command line but do not execute the command. This
           option may be used to verify and to validate the command line.


           Enables verbose output. Might not be supported by  all  filesystem-
           specific fsck implementations.

       -y | Y

           Assume a yes response to all questions asked by fsck.

       -o specific-options

           These specific-options can be any combination of the following sep‐
           arated by commas (with no intervening spaces).


               Use block n as the super block for the file system. Block 32 is
               always  one  of the alternate super blocks. Determine the loca‐
               tion of other super blocks by running newfs(1M)  with  the  -Nv
               options specified.


               If the file system is in the old (static table) format, convert
               it to the new (dynamic table) format. If the file system is  in
               the  new  format, convert it to the old format provided the old
               format can support the file system configuration.  In  interac‐
               tive mode, fsck will list the direction the conversion is to be
               made and ask whether the conversion should be done. If a  nega‐
               tive  answer  is  given,  no further operations are done on the
               file system. In preen mode, the direction of the conversion  is
               listed  and  done if possible without user interaction. Conver‐
               sion in preen mode is best used when all the file  systems  are
               being  converted  at  once.  The format of a file system can be
               determined from the first line of output from fstyp(1M).  Note:
               the  c  option is seldom used and is included only for compati‐
               bility with pre-4.1 releases. There is no guarantee  that  this
               option will be included in future releases.


               Force checking of file systems regardless of the state of their
               super block clean flag.


               Check and fix the file system non-interactively ("preen"). Exit
               immediately  if there is a problem requiring intervention. This
               option is required to enable parallel file system checking.


               Check writable file systems only.


           file system is unmounted and OK


           erroneous parameters are specified


           file system is unmounted and needs checking (fsck -m only)


           file system is already mounted


           cannot stat device


           a filesystem that is mounted read/write was modified - reboot


           uncorrectable errors detected - terminate normally


           a signal was caught during processing


           uncorrectable errors detected - terminate immediately


           file system is mounted read-only and is OK

       The fsck command is large file aware for  UFS  file  systems,  per  the
       largefile(5) man page.


           default  local  file system type. Default values can be set for the
           following flags in /etc/default/fs. For example: LOCAL=ufs.


               The default partition for a command if no FSType is specified.


           list of default parameters for each file system

       See attributes(5) for descriptions of the following attributes:

       tab()  box;  cw(2.75i)  |cw(2.75i)  lw(2.75i)   |lw(2.75i)   ATTRIBUTE
       TYPEATTRIBUTE  VALUE _ Availabilitysystem/core-os _ Interface Stabil‐

       clri(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  sys‐
       tem 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.

SunOS 5.11                        13 Sep 2010                         fsck(1M)
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