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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 (This is a good way to split a large GRIB file)

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

   Note: we need to quote the name of the output so the shell does not interpret the square brackets




6. To copy fields whose typeOfLevel is either 'surface' or 'meanSea'

   Code Block
   > grib_copy -w typeOfLevel=surface/meanSea orig.grib out.grib

   Note: we need to quote the name of the output so the shell does not interpret the square brackets




7. To copy selected fields and apply sorting (sorted by level in ascending order)

   Code Block
   > grib_copy -w typeOfLevel=heightAboveGround -B'level:i asc' tigge_af_ecmwf.grib2 out.grib

   Note: we need to specify the ':i' to get a numerical sort. By default values are sorted as strings so a level of 100 would come before 20!

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