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This works for GRIB, BUFR, ODB and netCDF files. The file type must be the first argument. 

Extra Work

Take some of the macros you've already written and convert them so that they can run in batch mode. In most cases it will not require much work - here are the main things to consider:

• the macro should be runnable both interactively and in batch mode
• if the macro returns data, it should write it to disk instead
• if the macro plots data, it should generate a graphics file instead
• if the macro has some parameters hard-coded into it, they should become command-line arguments