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BSD 2.11 - man page for icheck (bsd section 8)

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ICHECK(8)										ICHECK(8)

       icheck - file system storage consistency check

       icheck [ -s ]  [ -b numbers ] [ filesystem ]

       Icheck  examines a file system, builds a bit map of used blocks, and compares this bit map
       against the free list maintained on the file system.  If the file system is not specified,
       a  set  of default file systems is checked.  The normal output of icheck includes a report

	      The total number of files and the numbers of regular, directory, block special  and
	      character special files, quota nodes, and symbolic links.

	      The  total number of blocks in use and the numbers of single-, double-, and triple-
	      indirect blocks and directory blocks.

	      The number of free blocks.

	      The number of blocks missing; i.e. not in any file nor in the free list.

       The -s option causes icheck to ignore the actual free list and reconstruct a  new  one  by
       rewriting  the super-block of the file system.  The file system should be dismounted while
       this is done; if this is not possible (for example if the root file system has to be  sal-
       vaged)  care  should be taken that the system is quiescent and that it is rebooted immedi-
       ately afterwards so that the old, bad in-core copy of the super-block will not continue to
       be  used.   Notice  also  that the words in the super-block which indicate the size of the
       free list and of the i-list are believed.  If the super-block has been curdled these words
       will have to be patched.  The -s option causes the normal output reports to be suppressed.

       Following the -b option is a list of block numbers; whenever any of the named blocks turns
       up in a file, a diagnostic is produced.

       Icheck is faster if the raw version of the special file is used, since it reads the i-list
       many blocks at a time.

       filsys(5), clri(8), dcheck(8), fsck(8), ncheck(8)

       For  duplicate  blocks and bad blocks (which lie outside the file system) icheck announces
       the difficulty, the i-number, and the kind of block involved.  If a read error is  encoun-
       tered,  the block number of the bad block is printed and icheck considers it to contain 0.
       `Bad freeblock' means that a block number outside the available space was  encountered  in
       the  free  list.   `n  dups in free' means that n blocks were found in the free list which
       duplicate blocks either in some file or in the earlier part of the free list.

       Since icheck is inherently two-pass in nature, extraneous diagnostics may be  produced  if
       applied	to  active  file  systems.   Since  default file systems vary with installations,
       icheck should use fstab(5).
       It believes even preposterous super-blocks and consequently can get core images.

3rd Berkeley Distribution								ICHECK(8)
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