Syntax:  hdedit  (FITS file(s))  [-view] [-novi]
   ..         [card=type~name~value [-nuc]]
     Read FITS file, edit header (execute vi on a temporary
     file /tmp/hdedit.temp), write FITS file.  The header is
     "cleaned up" before writing it back out.
  -view : view only do not write back out.
  -novi : use an editor other than vi.
  card= : Change or add header card; type = I, F, L, C, or D
          for integer, real, logical, character, and delete.
          If card= is given, the editor is not executed.
  -nuc  : No upper case, allows card name to have lower case.