Source : Free On-Line Dictionary of Computing

Grim File Reaper
     
         (GFR) An {ITS} and {LISP Machine}
        utility to remove files according to some program-automated or
        semi-automatic manual procedure, especially one designed to
        reclaim mass storage space or reduce name-space clutter (the
        original GFR actually moved files to tape).
     
        See also {prowler}, {reaper}.  Compare {GC}, which discards
        only provably worthless stuff.
     
        (1996-06-20)