Quick question:

What do I have to insert here for *youruser* and *yourgroup* ?

wget http://109.230.224.65/~nxt/nxt_rasppi.tar.gz
tar -xpf nxt_rasppi.tar.gz
chown -R *youruser*:*yourgroup* nxt/
cd nxt
ln -fs webapps/root/WEB-INF/web.xml configfile
./run_nxt.sh