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Expected output for 'h5diff h5diff_test1.h5'
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h5diff [OBJ1_NAME] [OBJ2_NAME] [-h] [-l] [-r] [-d] [-n count] [-d delta] [-p relativet] FILE1_NAME FILE2_NAME

  [OBJ1_NAME]       Name of an HDF5 object
  [OBJ2_NAME]       Name of an HDF5 object
  [-h ]             Print a basic help message (this message)
  [-l ]             List contents of file
  [-r ]             Print only what objects differ
  [-n count]        Print difference up to count number for each variable
  [-d delta]        Print difference when it is greater than limit delta
  [-p relative]     Print differences which are within a relative error value
  FILE1_NAME        File name of the first HDF5 file
  FILE2_NAME        File name of the second HDF5 file

Items in [ ] are optional