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Apply the rules defined in rules_file to each grib BUFR message in the grib BUFR files provided as arguments.
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Output grib is written to output_grib_file. If an output grib file is required and -o is not used, the output grib is written to filtered.out
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Multi-field support off. Turn off support for multiple fields in single grib message.
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Version.
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Copy GTS header.
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GRIBEX compatibility mode.
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Does not fail when the message has wrong length
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