if [ $# == 0 ] ; then
   files=*.fits
else
   files=""
fi 

dfits $files $@ | fitsort FT.ROBJ.NAME INS.SOBJ.NAME DPR.CATG DPR.TYPE INS.POLA.MODE INS.SPEC.RES DET2.SEQ1.DIT DET2.NDIT DET3.SEQ1.DIT