Ruby Installation with graphics (painful)  ==============================   * Install RVM for Ruby -  \curl -#L https://get.rvm.io  | bash -s stable --autolibs=3 --ruby   * Install TK from ActiveTcl - http://www.activestate.com/activetcl   * Run  rvm reinstall 2.0.0 --enable-shared --enable-pthread --with-tk --with-tcl   Recommended Sites  ==================   1. From author (Yukihiro Matsumore)   http://rubymonk.com/   2. Basic  http://www.tutorialspoint.com/ruby/ruby_variables.htm    Interactive Tutorial  ==============  http://tryruby.org/   Run ruby  =========  1. Using interpreter   irb ( start interpreter)  load "fname.rb" ( load the file)  ruby  "fname.rb" ( run the file)   2. Using ruby command   ruby  "fname.rb" ( run the file)   3. Type of Variables & Mehod  ====================    @instanceVariable    @@classVariable  $GlobalVariable    4. instanceMethod   def fnc  ...  end   5. ClassMethod  =============  def self.fnc  ...  end    6. Ano...