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

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DCHECK(8)										DCHECK(8)

NAME
       dcheck - file system directory consistency check

SYNOPSIS
       dcheck [ -i numbers ] [ filesystem ]

DESCRIPTION
       Dcheck  reads  the directories in a file system and compares the link-count in each i-node
       with the number of directory entries by which it is referenced.	If the file system is not
       specified, a set of default file systems is checked.

       The  -i flag is followed by a list of i-numbers; when one of those i-numbers turns up in a
       directory, the number, the i-number of the directory,  and  the	name  of  the  entry  are
       reported.

       The program is fastest if the raw version of the special file is used, since the i-list is
       read in large chunks.

SEE ALSO
       filsys(5), clri(8), fsck(8), icheck(8), ncheck(8)

DIAGNOSTICS
       When a file turns up for which the link-count and the number  of  directory  entries  dis-
       agree,  the  relevant  facts are reported.  Allocated files which have 0 link-count and no
       entries are also listed.  The only dangerous situation occurs when there are more  entries
       than  links;  if  entries are removed, so the link-count drops to 0, the remaining entries
       point to thin air.  They should be removed.  When there are more links  than  entries,  or
       there is an allocated file with neither links nor entries, some disk space may be lost but
       the situation will not degenerate.

BUGS
       Since dcheck is inherently two-pass in nature, extraneous diagnostics may be  produced  if
       applied	to  active  file  systems.  Default file systems vary with installation so dcheck
       should use fstab(5).

3rd Berkeley Distribution								DCHECK(8)
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