Tcl/tk for GRASS

Hello Users
       I'm learning Tcl/tk to use in GRASS with Linux in my Phd Tesis.
       I need applications scripts examples of Tcl/tk for Grass. Could anybody
       tell me where I could get these applications?
             Thanking you in advance
              
                                              Sandra Garcia
                                E-mail: sandra@dihma.upv.es