first, as lardman said, you need to change permissions on lisp.run to make it executable:
chmod a+x list.run
to run the system, use
./lisp.run -B `pwd` -M maxima-clisp.mem
The characters around pwd are backticks, not single quotes.
This will start clisp, and MAXIMA (a math package) will be running. To drop down to normal Lisp, use:
to_lisp();
Now, if only I could find a good editor.