Library /sys$common/syshlp/DFUHLP.HLB
DFU, DIRECTORY, Qualifiers, /COMPRESS
 *Conan The Librarian 

    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.
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