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Install Ruby 1.9.2 On Rails 3 Inside RVM And Make Project-specific Gem Set

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        If you had global rvm install before, you might need to check /etc/rvmrc file

Install RVM and pre-requirements
sudo apt-get install bash curl git build-essential openssl libreadline6 libreadline6-dev curl git-core zlib1g zlib1g-dev libssl-dev libyaml-dev libsqlite3-0 libsqlite3-dev sqlite3 libxml2-dev libxslt-dev autoconf libc6-dev ncurses-dev automake libtool bison subversion

bash -s stable < <(curl -s )
source /etc/profile.d/

Add these lines to ~/.bashrc:
# This loads RVM into a shell session.
[[ -s "$HOME/.rvm/scripts/rvm" ]] && . "$HOME/.rvm/scripts/rvm" 

Run following to test RVM and install pre-requirements specified there:
rvm notes

Install default Ruby 1.9.2 and test it:
rvm install 1.9.2
rvm --default ruby-1.9.2 
ruby -v

Create project-specific gemset, make it default, install Rails with pre-requirements:
rvm gemset create my_project
rvm use 1.9.2@my_project --default

Then either create a new project:
gem install rails
rails my_project

Or install dependencies for an existing project:
cd my_project
gem install bundle
bundle install