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mapreduce and shell scripting

1. map is easy to implement using makefiles and the "-j" option.  a
   simple driver script can then provide the right arguments (Makefile
   is target driven)

2. reduce can be done on a *.<ext> after map has finished.

Implemented for jpeg->ps map and ps->ps->pdf reduce.  Works quite
well (see pool/mk/* and pool/bin/mk)



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