Name
     dfits - display FITS file header information

Synopsis
     dfits [-x xtnum] 
     dfits [-x xtnum] -

Description
     dfits displays FITS header informations on stdout. Header information
     can be found in the main header only (default), in extensions, or in
     both.  See the -x option below.  dfits accepts multi-file input.
     'dfits -' expects single file data coming from stdin.

Options
     -x xtnum
          Specifies the extension to print out. Extensions are numbered
          starting from 1. If this option is not specified, only the main
          header is printed out. If this option specifies an extension that
          does not exist, nothing is printed out.
          Specify 0 as extension number to get a print of the main header
          plus all extension headers.

     Examples :
     dfits *.fits
     dfits *.fits | grep NAXIS3
     gzip -d < star.fits.gz | dfits - | more
     dfits -x 0 *.fits
     dfits -x 3 *.fits

See Also
     fitsort can be combined with dfits output to sort out keyword values
     of a group of FITS files.

Files
     Files shall all comply with FITS format

Author
     N. Devillard - ESO