The wgrib program is by Wesley Ebisuzaki.  He can be
reached at Wesley.Ebisuzaki@noaa.gov

The wgrib homepage is:
http://www.cpc.ncep.noaa.gov/products/wesley/wgrib.html

This has source available, help, hints, docs, beta
releases, etc.

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Simple usage of the wgrib program (under the "howto:
grib -> ieee" section of the web page:

usage similar to diffwrf
wgrib -s GRIBFILE | wgrib -s -i GRIBFILE
This generates an ieee binary file called dump

wgrib -s GRIBFILE | wgrib -s -i -text GRIBFILE
This generates a text file called dump (text is
50-100x slower than ieee)

wgrib -s GRIBFILE | wgrib -s -i -text -o outfile GRIBFILE
This generates a text file called outfile