def prtOptions():
    """Print a list of command-line options and arguments."""
    print('The command-line arguments are:')
    print('  -h (print help)')
    print('  --help (print help)')
    print('  -r (print the full version string)')
    print('  --version (print the version number)')
    print('  -v (print messages)')
    print('  input:  input corrtag file name')
    print("  output:  output corrtag file name, or '' or none")
    print('      if output was not specified, the input file will be modified')
    print('      in-place (unless filter was also not specified, equivalent to'
        )
    print("      filter='info')")
    print('  filter:  column name, relation, cutoff value')
    print("      e.g. 'sun_alt > -0.5 or ly_alpha > 2'")
    print("      or 'info' or 'reset' ('clear' is synonymous with 'reset')")
