GLOBAL FORECAST SYSTEM
The command copygb copies all or part of one GRIB file to another
GRIB file, interpolating if necessary.
copygb can be found at:
Documentation is in:
The NCEP grids for the -g option are listed in:
Documentation for the interpolation options are covered in:
/nwprod/lib/sorc/ip/iplib.doc (though some parts may be outdated).
There's also web doc for each routine at:
but the info needed for copygb is more readily available in the simple text file /nwprod/lib/sorc/ip/iplib.doc.
If you want to dig into any "w3" subroutines referenced, they generally have good docblocks in their source code. The directory is:
and a there's a web doc at: