DuckCorp Dico

Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   chunker
   dechunker
   split
      <programming> A program like Unix's "split" which breaks an
      input file into parts, usually of a pre-set size, e.g. the
      maximum size that can fit on a floppy.  The parts can then
      be assembled with a dechunker, which is usually just the
      chunker in a different mode.
      (1998-12-15)