title: cat ~/.gemrc results in "no such file or directory"
body: <p>I just finished install Xcode, Homebrew, git, RVM and Ruby on a brand new MacBook Pro machine (following this <a href="http://www.moncefbelyamani.com/how-to-install-xcode-homebrew-git-rvm-ruby-on-mac/" rel="nofollow">guide</a>). Next thing I wanted to do is install Rails (following this <a href="http://railsapps.github.com/installing-rails.html#gems" rel="nofollow">guide</a>) but cat ~/.gemrc only gives me a "No such file or directory". Any ideas on what I may haven't done properly? Is there a way I can create this file manually - and is such a thing advised or not?</p>
  
  <p><strong>EDIT:</strong></p>
  
  <pre><code>gem environment
  </code></pre>
  
  <p>gives this output</p>
  
  <pre><code>RubyGems Environment:
  - RUBYGEMS VERSION: 1.8.24
  - RUBY VERSION: 1.9.3 (2012-11-10 patchlevel 327) [x86_64-darwin12.2.0]
  - INSTALLATION DIRECTORY: /Users/sebkomianos/.rvm/gems/ruby-1.9.3-p327
  - RUBY EXECUTABLE: /Users/sebkomianos/.rvm/rubies/ruby-1.9.3-p327/bin/ruby
  - EXECUTABLE DIRECTORY: /Users/sebkomianos/.rvm/gems/ruby-1.9.3-p327/bin
  - RUBYGEMS PLATFORMS:
    - ruby
    - x86_64-darwin-12
  - GEM PATHS:
     - /Users/sebkomianos/.rvm/gems/ruby-1.9.3-p327
     - /Users/sebkomianos/.rvm/gems/ruby-1.9.3-p327@global
  - GEM CONFIGURATION:
     - :update_sources =&gt; true
     - :verbose =&gt; true
     - :benchmark =&gt; false
     - :backtrace =&gt; false
     - :bulk_threshold =&gt; 1000
  - REMOTE SOURCES:
     - http://rubygems.org/
  </code></pre>
  
  <p>So I guess the configuration file exists somewhere and I only need to add</p>
  
  <pre><code>install: --no-rdoc --no-ri
  update: --no-rdoc --no-ri
  </code></pre>
  
  <p>to it so I avoid the rdoc and ri on every gem installation.</p>