title: rvm gemdir gives error ~/.rvm/scripts/gemsets: line 786: rvm command not found
body: <p>I get an "rvm: command not found error" on rvm gemdir, but only when I'm using one of the rvm ruby installations.  I get the same result with 1.9.2 and 1.8.7 (the only ones I've tried):</p>
  
  <pre><code>$ rvm install 1.8.7
  ...
  Installation of rubygems completed successfully.
  ...
  Install of ruby-1.8.7-p334 - #complete 
  
  # works ok using system ruby
  $ rvm gemdir
  /Library/Ruby/Gems/1.8
  
  $ rvm use 1.8.7
  Using /Users/aneil/.rvm/gems/ruby-1.8.7-p334
  
  #
  # HERE IS THE ERROR:
  #
  $ rvm gemdir
  /Users/aneil/.rvm/scripts/gemsets: line 786: rvm: command not found
  /Users/aneil/.rvm/gems/ruby-1.8.7-p334
  
  $ rvm use system
  Now using system ruby.
  
  $ rvm gemdir
  /Library/Ruby/Gems/1.8
  </code></pre>
  
  <p>Any ideas what's going on here?  Should I be concerned?</p>
  
  <p>Thanks.</p>