[Unix] When used without a qualifier, generally refers to
crunching of a file using a particular C
implementation of compression by Joseph M. Orost 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.