Ruby on Rails

Hi, guys,
I successfully installed the rvm but the rvm command is unavailable ,
the installation message as the following :

dengx@dengx-desktop:~$ gem -v
1.8.5

dengx@dengx-desktop:~$ sudo gem install rvm
Fetching: rvm-1.6.20.gem (100%)
********************************************************************************

This gem contains only the Ruby libraries for the RVM Ruby API.

In order to install RVM please use one of the methods listed in the
documentation:

https://rvm.beginrescueend.com/rvm/install/

such as,

bash < <(curl -s -B https://rvm.beginrescueend.com/install/rvm)

followed by placing the sourcing line in your ~/.bash_profile or
wherever may
be appropriate for your setup (example, .zshenv, /etc/profile, ...):

# Load RVM into a shell session *as a function*
[[ -s "$HOME/.rvm/scripts/rvm" ]] && . "$HOME/.rvm/scripts/rvm"

After completing setup please open a new shell to use RVM and be
sure to run
'rvm notes' to gain a list of dependencies to install before
installing the
first Ruby. You can read more details about this process on the
above
mentioned install page as well as the basics page:

https://rvm.beginrescueend.com/rvm/basics/

Enjoy!

~Wayne

********************************************************************************
Successfully installed rvm-1.6.20
1 gem installed
Installing ri documentation for rvm-1.6.20...
Installing RDoc documentation for rvm-1.6.20...

dengx@dengx-desktop:~$ rvm --default use 1.9.2
No command 'rvm' found, but there are 20 similar ones
rvm: command not found

thanks all.

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