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1. To copy only the pressure levels from a file

   Code Block
   > grib_copy -w levtype=pl ../data/tigge_pf_ecmwf.grib2 out.grib




2. To copy only the fields that are not on pressure levels from a file

   Code Block
   > grib_copy -w levtype!=pl ../data/tigge_pf_ecmwf.grib2 out.grib




3. To copy only the first three fields from a file

   Code Block
   > grib_copy -w count=1/2/3 ../data/tigge_pf_ecmwf.grib2 out.grib




4. A grib_file with multi field messages can be converted in single field messages with a simple grib_copy.

   Code Block
   > grib_copy multi.grib simple.grib




5. Use the square brackets to insert the value of a key in the name of the output file.

   Code Block
   > grib_copy in.grib 'out_[shortName].grib'