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CMEM Input/Output are coded in a modular way, so that the user can choose either ASCII, GRIB or NETCDF I/O format. For any of these I/O type, CMEM is flexible with automatic detection of the Input files sizes. See the description of CMEM I/O .
A test data set is provided, including input/Output in the three formats (grib, acsii, netcdf). It is compatible since cmem 5.1. 3. Output files are obtained with CMEM v4v5.0.1.
Note that for grib input/output you can use either GRIB API encoding ('gribapi' option, which is the default in cmem v2.1) or GRIBEX encoding ('gribex' option which was the default option until cmem_v1.3, named 'grib' at this stage).