fits-flip-endian --version (return code: 0)
fits-flip-endian: invalid option -- '-'
fits-flip-endian -i <input-file>
-o <output-file>
[ -e <extension-number> -s <data-size-in-bytes> ] ...
fits-flip-endian --help (return code: 0)
fits-flip-endian: invalid option -- '-'
fits-flip-endian -i <input-file>
-o <output-file>
[ -e <extension-number> -s <data-size-in-bytes> ] ...