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By default grib_index_build will index on the MARS keys. \n
Code Block >> grib_index_build ../data/reduced*.grib1 ../data/regular*.grib1 ../data/reduced*.grib2
To specify a custom list of keys to index on, use the -k option. \n
Code Block >> grib_index_build -k paramId,dataDate ../data/reduced*.grib1 ../data/regular*.grib1 ../data/reduced*.grib2