I wrote the preciew version of scripting engine. I'll add some comments
soonly.
Parser parses everytime one command because the commands could be
entered from
commandline. Bison converts in kind of pseudocode. Arithmethic support
will be done
by separate parser because arithmetic parse is very different form bash one.
Patch is attached. The next thing I'll do is adding entry handling and
changing menu
parser to the call of scripting engine. It would be good if then it
could be incorporated
to CVS because it would be easy to developpe and debug.

                                                                        
            Vladimir