sudo gem install rails- this doesn't give me a rails command for bash

Question

I'm on Ubuntu. I type in sudo gem install rails. This works fine, installs railes and 7 other gems fine. Yet $ rails blog is saying this:

The program 'rails' is currently not installed.  You can install it by typing:
sudo apt-get install rails

Answer 1

Type

gem env

It will give you the installable directory where the bins of the gems are being installed. Something like this:

EXECUTABLE DIRECTORY: /usr/bin

Make sure this directory is in your path.

Answer 2

how did you install rubygems, as an admin, or as a user? if you installed it as a user, it may not have the bin directory in your path.

If I were you, (assuming you installed rubygems into your home folder), I would trash that installation dir (not sure where it defaults to, maybe ~/rubygems? or ~/.rubygems?), then run setup.rb from the rubygems tarball as admin (through sudo) I've done this at least a dozen times on ubuntu, and haven't run into the issue you are hitting.

If that isn't the case, could you please link to the blog post you were following?