title: Showing Ruby 1.8.7 after installing 1.9.3 on Mac OSX
body: <p>I thought I have installed ruby 1.9.3-p327. But when I do ruby -v, it still output 1.8.7 as you see below.</p>
  
  <p>What is wrong?</p>
  
  <p>I use OSX 10.7.5 and I installed osx-gcc-installer and Xcode 4.5.2.</p>
  
  <p>UPDATES:
  I checked /User/teacher/.rvm/bin/folder and I found there are ruby-1.9.3 files.</p>
  
  <pre><code>Last login: Mon Nov 26 19:50:24 on ttys000
  sokada-macbook:~ teacher$ sudo rvm install 1.9.3
  Password:
  No binary rubies available for: downloads/ruby-1.9.3-p327.
  Continuing with compilation. Please read 'rvm mount' to get more information on binary rubies.
  Fetching yaml-0.1.4.tar.gz to /Users/teacher/.rvm/archives
    % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                   Dload  Upload   Total   Spent    Left  Speed
  100  460k  100  460k    0     0   184k      0  0:00:02  0:00:02 --:--:--  196k
  Extracting yaml to /Users/teacher/.rvm/src/yaml-0.1.4
  Configuring yaml in /Users/teacher/.rvm/src/yaml-0.1.4.
  Compiling yaml in /Users/teacher/.rvm/src/yaml-0.1.4.
  Installing yaml to /Users/teacher/.rvm/usr
  Installing Ruby from source to: /Users/teacher/.rvm/rubies/ruby-1.9.3-p327, this may take a while depending on your cpu(s)...
  ruby-1.9.3-p327 - #downloading ruby-1.9.3-p327, this may take a while depending on your connection...
  ruby-1.9.3-p327 - #extracting ruby-1.9.3-p327 to /Users/teacher/.rvm/src/ruby-1.9.3-p327
  ruby-1.9.3-p327 - #extracted to /Users/teacher/.rvm/src/ruby-1.9.3-p327
  ruby-1.9.3-p327 - #configuring
  ruby-1.9.3-p327 - #compiling
  ruby-1.9.3-p327 - #installing 
  Retrieving rubygems-1.8.24
    % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                   Dload  Upload   Total   Spent    Left  Speed
  100  371k  100  371k    0     0   819k      0 --:--:-- --:--:-- --:--:-- 1819k
  Extracting rubygems-1.8.24 ...
  Removing old Rubygems files...
  Installing rubygems-1.8.24 for ruby-1.9.3-p327 ...
  Installation of rubygems completed successfully.
  Saving wrappers to '/Users/teacher/.rvm/bin'.
  ruby-1.9.3-p327 - #adjusting #shebangs for (gem irb erb ri rdoc testrb rake).
  ruby-1.9.3-p327 - #importing default gemsets (/Users/teacher/.rvm/gemsets/), this may take time ...
  Install of ruby-1.9.3-p327 - #complete 
  'rvm_codesign_identity' is not set, please set it in ~/.rvmrc
  sokada-macbook:~ teacher$ rvm -v
  
  rvm 1.16.20 (master) by Wayne E. Seguin &lt;wayneeseguin@gmail.com&gt;, Michal Papis &lt;mpapis@gmail.com&gt; [https://rvm.io/]
  
  sokada-macbook:~ teacher$ ruby -v
  ruby 1.8.7 (2012-02-08 patchlevel 358) [universal-darwin11.0]
  sokada-macbook:~ teacher$ chmod -x $rvm_path/hooks/after_install_codesign
  sokada-macbook:~ teacher$ ruby -v
  ruby 1.8.7 (2012-02-08 patchlevel 358) [universal-darwin11.0]
  sokada-macbook:~ teacher$ 
  </code></pre>