To run this, you can try:
curl -ks https://gist.github.com/bojoer/8613437/raw/uninstall-node.sh | bash
Alternatively,
curl -ksO https://gist.github.com/bojoer/8613437/raw/uninstall-node.sh
chmod +x ./uninstall-node.sh
./uninstall-node.sh
rm uninstall-node.sh