CDO

# This succeeds:

cdo genbil,grid_NH-40KM.nc grid_CMN-5x5.nc scrip-con_CMN-5x5_NH-40KM.nc

# This one fails:

cdo gencon,grid_NH-40KM.nc grid_CMN-5x5.nc scrip-con_CMN-5x5_NH-40KM.nc

# This succeeds, as long as grid desc files are defined by hand (not by cdo):

cdo gencon,grid_NH-40KM.txt -setgrid,grid_CMN-5x5.txt grid_CMN-5x5.nc scrip_CMN-5x5_NH-40KM.nc

## ajr: note, the following grid desciption files fail with gencon:

# Generate the source grid description file

##cdo griddes grid_CMN-5x5.nc > grid_CMN-5x5.txt

# Generate the target grid description file

##cdo griddes grid_NH-40KM.nc > grid_NH-40KM.txt