/USAGE(=uic or identifier)

    Generate a diskblock usage report. DFU will report per
    UIC/Identifier the blocks used/allocated, and the number of file
    headers used. If diskquota is enabled a third column will be
    added to the report with the blocks used according to QUOTA.SYS.
    If an UIC or Identifier is entered then only that UIC will be
    reported. The diskquota used must satisfy the rule :

    QUOTA used = blocks allocated + # of file headers.

    Symbols The following symbols are created. The names should be
    reasonably self explanatory. The values shown here are examples
    to demonstrate the expected format.

    o  DFU$AVERAGE_EXTENT_SIZE = "289574"

    o  DFU$AVERAGE_SIZE_PER_FRAGMENT = "1348"

    o  DFU$AVG_FRAGMENTS_PER_FILE = "1.017"

    o  DFU$BLOCKS_MARKED_FOR_DELETE = "502560"

    o  DFU$CLUSTER_SIZE = "80"

    o  DFU$CONTIGUOUS_FILES = "212712"

    o  DFU$DEVICE_NAME = "$1$DGA5:"

    o  DFU$DIRECTORY_FILES = "6484"

    o  DFU$EMPTY_FILES = "955"

    o  DFU$ERASE_ON_DELETE = "FALSE"

    o  DFU$FILES_MARKED_FOR_DELETE = "37"

    o  DFU$FILES_WITH_ALLOCATION = "212803"

    o  DFU$FILES_WITH_EXTENSION_HEADERS = "193"

    o  DFU$FILE_FRAGMENTATION_INDEX = "0.067"

    o  DFU$FILE_FRAGMENTATION_INDEX_RATING = "excellent"

    o  DFU$FIRST_HEADER_VBN = "429"

    o  DFU$FRAGMENTS = "216378"

    o  DFU$FREEBLOCKS_DRIFT = "6160"

    o  DFU$FREE_BLOCKS = "98744960"

    o  DFU$FREE_HEADERS = "15059"

    o  DFU$FREE_SPACE_FRAGMENTATION_INDEX = "0.000"

    o  DFU$FREE_SPACE_FRAGMENTATION_INDEX_RATING = "excellent"

    o  DFU$HEADERS = "213973"

    o  DFU$HEADER_COUNT = "229052"

    o  DFU$HIGHWATER_MARK = "FALSE"

    o  DFU$LARGEST_DIRECTORY_FILE = "[USERS.FOO]SCA.DIR;1"

    o  DFU$LARGEST_FREE_EXTENT = "21140000"

    o  DFU$MAX_FILES = "439092"

    o  DFU$MOST_FRAGMENTED_FILE = "[USERS.FOO]BAR.LOG;8"

    o  DFU$MOST_FRAGMENTED_FILE_FRAGMENTS = "406"

    o  DFU$PERCENTAGE_FREE = "0.000"

    o  DFU$TOTAL_ALLOCATED_SIZE = "291879840"

    o  DFU$TOTAL_BLOCKS = "390624768"

    o  DFU$TOTAL_FILES = "213758"

    o  DFU$TOTAL_FILES_ODS2 = "41965"

    o  DFU$TOTAL_FILES_ODS5 = "171793"

    o  DFU$TOTAL_FREE_EXTENTS = "341"

    o  DFU$TOTAL_USED_SIZE = "260158290"

    o  DFU$VOLUME_NAME = "USER "

    o  DFU$VOLUME_OWNER = " "

    o  DFU$VOLUME_SET_NAME = " "