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compress: [UNIX] vt. When used without a qualifier, generally
   refers to crunching of a file using a particular
   C implementation of compression by James A. Woods et al. and
   widely circulated via USENET; use of crunch itself in
   this sense is rare among UNIX hackers.  Specifically, compress is
   built around the Lempel-Ziv-Welch algorithm as described in "A
   Technique for High Performance Data Compression", Terry A. Welch,
   "IEEE Computer", vol. 17, no. 6 (June 1984), pp. 8--19.