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Tool implementation for generating Avro JSON schemata from
genavro format files.
err.println("Usage: GenAvroTool [in] [out]");
err.println("If an output path is not specified, outputs to stdout.");
err.println("If no input or output is specified, takes input from");
err.println("stdin and outputs to stdin.");
err.println("The special path \"-\" may also be specified to refer to");
return "Generates a JSON schema from a GenAvro file";