shell can't find my ruby gem/ node library

Question

I want to interact with http app, so I find htty and http-console .

I use

gem install htty

Or

npm install http-console

But my shell seems can't these commands. So I need add to my PATH or something else?

Edit: I am using OS X Lion and I have npm and gem ,both packages are successfully installed. I try to type the two commands in terminal, but commands not found appeared.

Answer 1

Make sure you have gem and npm installed. Enter the following command and see if they are installed (and what versions):

gem -v && npm -v