dcheck - Checks directory consistency
/usr/sbin/dcheck [-i inumbers] [filesystem]
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.
The -i flag is specified with a list of inumbers. If a specified inumber is found in a directory, the dcheck command displays the inumber, the inumber of the directory, and the name of the entry.
Because the dcheck command uses two passes to check directories, it may produce erroneous diagnostics if active file systems are checked.
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.
Commands: clri(8), fsck(8), icheck(8), ncheck(8)
Files: fs(4) delim off