yap.
you could even just use the editor or wordpad but the syntax highlighting is very comfortable.
(especially if you want to understand what the script is doing and how it is doing)

copy&paste it. save it with .sh extension. copy it on your n900. open xterm. get root rights (install rootsh and type "sudo gainroot") make it executable with "chmod +x bla.sh" and then just run it with ". bla.sh" or "sh bla.sh".

BUT: please be aware... if you don't know what the script is doing exactly.. it could lead to some problems... if not right now - then maybe in the futuere (next update or so)