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dcheck(8) [bsd man page]

DCHECK(8)						      System Manager's Manual							 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 direc- tory, 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 disagree, 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 sys- tems vary with installation so dcheck should use fstab(5). 3rd Berkeley Distribution DCHECK(8)

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dcheck(8)						      System Manager's Manual							 dcheck(8)

NAME
dcheck - Checks directory consistency SYNOPSIS
/usr/sbin/dcheck [-i inumbers] [filesystem] OPTIONS
The -i option is specified with a list of inumbers. If a specified inumber is found in a directory, the dcheck command displays the inum- ber, the inumber of the directory, and the name of the entry. DESCRIPTION
The fsck command supersedes the dcheck command for normal consistency checking. The dcheck command reads the directories in a file system and compares the link-count in each inode with the number of directory entries by which it is referenced. If a file system is not specified, a set of default file systems is checked. To get optimum performance, specify the raw version of the special file because the ilist is read in large chunks. RESTRICTIONS
Because the dcheck command uses two passes to check directories, it may produce erroneous diagnostics if active file systems are checked. ERRORS
If a file is found and the link-count and the number of directory entries do not agree, dcheck reports relevant information. Allocated files that have 0 link-count and no entries are also listed. A potentially dangerous situation occurs if there are more entries than links. If entries are removed and the link-count drops to zero (0), the remaining entries point to nothing should be removed. If there are more links than entries or if there is an allocated file with neither links nor entries, some disk space may be lost. SEE ALSO
Commands: clri(8), fsck(8), icheck(8), ncheck(8) Files: fs(4) dcheck(8)
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