Instal RVM on Linux Ubuntu 64 Bit

RVM is a command-line tool which allows you to easily install, manage, and work with multiple ruby environments from interpreters to sets of gems. To install Ubuntu in RVM

1. Check Apache and Mysql existed in your machine.

•  Type http://localhost or http://127.0.0.1 on your browser to check apache running.
• Check /var/www/ directory.
• In /var/www/index.html type <?php phpinfo(); ?> , then type http://localhost or http://127.0.0.1 on your browser. If apache installation in your machine already correct, your browser will load PHP informations installed on your machine

2.Run on your terminal:

• bash -s stable < <(curl -s https://raw.github.com/wayneeseguin/rvm/master/binscripts/rvm-installer)

• source ~/.bash_profile .Note : This command is for reload opened terminal. 
• rvm requirements. Note : This command is for searching all libs that still needed, and then install the lib.

 3. Install Ruby according to the version we need:     

• rvm install 1.9.3

4.Install another version of ruby with this method.
5. To view all installed RVM 

• rvm list

6.To use specifics RVM 

• rvm use 1.9.3

 7.If there is an error when running rvm use 1.9.3 try open file ~/.bashrc and ~/.bash_profile and then add this script :

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

8. To use Specifics Gemset

• rvm use 1.9.3

• rvm gemset use rails3.2

• rvm use 1.9.3@rails3.2

9. Set Default RVM

• rvm use 1.9.3@rails3.2 --default