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

  /EBLOCK[=block]

   This qualifier will reset the  end-of-file mark to the highest block
   allocated if no block has been specified.  Otherwise the end-of-file
   mark will be set to the specified block.
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