nodejs vs node on ubuntu 12.04

I installed nodejs on ubuntu from instructions given here

When I write node --version in the terminal I see this :
-bash: /usr/sbin/node: No such file or directory

I can see node in the /usr/sbin/ directory, though.

Writing npm --version shows 1.3.5
Writing nodejs --version shows v0.10.15

Also, I can see node in the /usr/bin/ directory.

So, how do I get node working?

Also, If I use zsh instead of bash, then node command works.