fsck man page on SunOS

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fsck(1M)		System Administration Commands		      fsck(1M)

NAME
       fsck - check and repair file systems

SYNOPSIS
       fsck  [-F FSType] [-m] [-V] [special]...

       fsck  [-F FSType] [-n |	N |  y |  Y] [-V] [-o FSType-specific-options]
       [special]...

DESCRIPTION
       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.

OPTIONS
       The following generic options are supported:

       -F FSType

	   Specify the file system type on which to operate.

       -m

	   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
	   as:

	     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.

       -V

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

       -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).

	   b=n

	       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.

	   c

	       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.

	   f

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

	   p

	       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.

	   w

	       Check writable file systems only.

EXIT STATUS
       0	    file system is okay and does not need checking

       1	    erroneous parameters are specified

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

       33	    file system is already mounted

       34	    cannot stat device

       36	    uncorrectable errors detected - terminate normally

       37	    a signal was caught during processing

       39	    uncorrectable errors detected - terminate immediately

       40	    for root, same as 0.

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

FILES
       /etc/default/fs

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

	   LOCAL

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

       /etc/vfstab

	   list of default parameters for each file system

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

       ┌─────────────────────────────┬─────────────────────────────┐
       │      ATTRIBUTE TYPE	     │	    ATTRIBUTE VALUE	   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Availability		     │SUNWcsu			   │
       └─────────────────────────────┴─────────────────────────────┘

SEE ALSO
       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)

WARNINGS
       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.

NOTES
       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 5.10			  7 May 2008			      fsck(1M)
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