1  DIRECTORY
   The DIRECTORY command provides 7 different functions depending on
   the qualifiers used.

   o  DIRECTORY/COMPRESS file - Compresses one or more directories

   o  DIRECTORY/DUMP file - Provides a block level dump of a
      directory

   o  DIRECTORY/REBUILD_MFD device - Recovers a corrupted MFD
      directory (000000.DIR)

   o  DIRECTORY/RECOVER file - Recovers a corrupted directory

   o  DIRECTORY/ALIAS device - Searches all directories on the
      device for alias file entries

   o  DIRECTORY/EMPTY device - Searches the disk for empty
      directories

   o  DIRECTORY/VERSION=n device - Searches all directories on the
      device for files which have at least n versions

   o  DIRECTORY/FILES=n device - Searches all directories on the
      device that have at least n file entries

Qualifiers /ALIAS, /EMPTY, and /VERSION can be combined in one
command. Other combinations of qualifiers are not possible.
 

2  Parameters
 

file,(@file)

   The /COMPRESS , /DUMP and /RECOVER qualifier require a directory-
   file name as a parameter. A logical name or an indirect command
   file can also be used as a parameter e.g.: DIR/COMPRESS
   @DIR.COM . Thus, it is possible to generate a list with SEARCH
   device/OUTPUT=file and use that file as input to the DIRECTORY
   command. The list generated by DFU SEARCH will contain the
   device name in the file specification. If a list of files is
   used from another source which does not contain the device name,
   the /DEVICE must be used to append the device name to the file.
 

device

   The /ALIAS, /EMPTY , /REBUILD_MFD and /VERSION qualifier require
   a device name as a parameter.
 

2  Qualifiers
 

/ALIAS

   Scan all directories on a disk for alias files.
 

/COMPRESS

   Recreates and compresses the directory. Because directories are
   alphabetically sorted files, deleting and entering files randomly
   will create 'holes' in directory files. /COMPRESS will remove
   these holes by rebuilding and truncating the directory.
 

/DEVICE

      /DEVICE=device-name

   Append the device name to the directory-file name. Can only be
   used with /COMPRESS or /DUMP
 

/DUMP

   Produces a dump of the directory file block by block. This
   command may be useful for debugging corrupted or suspected
   directories.
 

/EMPTY

   Scan the disk for empty directories.
 

/FILES

      /FILES=n

Searches all directories on the device that have at least n file
entries.
 

/FILL_FACTOR

   /FILL_FACTOR=percentage This qualifier is only valid in
   combination with /COMPRESS. Default behavior for DFU is to
   compress a directory as tight as possible; this is equivalent
   to /FILL_FACTOR=100. By choosing a lower fill factor value DFU
   will leave some free space in each directory block. /FILL_FACTOR
   may be between 50 and 100 %. Caution : choosing a fill factor
   value lower than 100% may fail if the directory file is not large
   enough. In that case DFU will signal an error and advise using a
   higher fill factor value.
 

/FORMAT

   /FORMAT=format_string Used with /VERSION and /OUTPUT. Create an
   output file using the format as described in format_string. The
   format string MUST contain the !AS directive; DFU fills in the
   resultant file there. Example :

   DFU> DIR/VERSION=3/OUT=P.COM/FORMAT="$purge !AS"
 

/OUTPUT

   /OUTPUT=filename This qualifier redirects the output from DFU to
   an output file.
 

/REBUILD_MFD

   Rebuilds the disk's 000000.DIR directory and makes sure the file
   backlinks to itself.
 

/RECOVER

   Rebuilds a corrupted directory file. Do not use this command on
   critical (system)directories!
 

/STATISTICS

      /STATISTICS
      /NOSTATISTICS (default)

   Controls whether CPU and I/O consumption of the command are
   shown.
 

/TEST

   This qualifier can be used only in conjunction with /COMPRESS.
   When /TEST is specified DFU will show the results of a directory
   compression without actually performing a compress operation.
 

/TRUNCATE

   /TRUNCATE(=n) This qualifier is only valid in combination with
   /COMPRESS. After compressing a directory DFU will NOT truncate
   the empty blocks at the end of the directory, unless /TRUNCATE is
   specified. A number 'n' may be specified to let DFU truncate no
   further than 'n' blocks ('n' will be rounded up to a multiple of
   the disks cluster size). Example: a 60 block directory A.DIR can
   be compressed to 20 blocks. The results are:

   o  DIR/COMPRESS -> A.DIR size 20/60 blocks

   o  DIR/COMPRESS/TRUNCATE -> A.DIR size 20/20 blocks

   o  DIR/COMPRESS/TRUNCATE=40 -> A.DIR size 20/40 blocks
 

/VERSION

   /VERSION=n Scan all directories of a given device for files which
   have at least 'n' versions.