GRASS questions

[karen Bryant x6541]

I would appreciate answers to any of the following
questions:

  1. Are there any modifications of r.reclass which 
     allow reclassification of data sets which 
     contain negative data values?

  2. Are there any modifications of r.mask which
     allow for its noninteractive use?

  3. Are there any written guides to the creation 
     and use of scripts in GRASS?

  4. Can scripts for GRASS be run only from within
     GRASS, or can they be run from UNIX also?


Thank you.

Karen Bryant