visad/src/main/java/ucar/nc2/iosp/gempak/GempakFileReader.java
public static void main(String[] args) throws IOException {
    if (args.length == 0) {
      System.out.println("need to supply a GEMPAK grid file name");
      System.exit(1);
    }

    GempakFileReader gfr = getInstance(getFile(args[0]), true);
    gfr.printFileLabel();
    gfr.printKeys();
    gfr.printHeaders();
    gfr.printParts();

  }
public static void main(String[] args) throws IOException {
    if (args.length == 0) {
      System.out.println("need to supply a GEMPAK grid file name");
      System.exit(1);
    }

    GempakFileReader gfr = getInstance(getFile(args[0]), true);
    gfr.printFileLabel();
    gfr.printKeys();
    gfr.printHeaders();
    gfr.printParts();

  }
Run the program

@param args filename
@throws IOException problem reading the file