Generic:
      nprepare - Prepare NIRI data for reductions 
                 (update headers, derive variance and DQ planes)

Imaging:
     nifastsky - Derive sky image for NIRI, median or min/max filtering
        niflat - Derive flat field and bad pixel mask for NIRI images 
         nisky - Derive sky image for NIRI, includes masking of objects
      nireduce - Reduce images from NIRI (dark or sky subtraction, flat)

      niriinfo - General help and information for the NIRI package