$ sudo gem update --system
Password:
Updating RubyGems...
Bulk updating Gem source index for: http://gems.rubyforge.org
Attempting remote update of rubygems-update
Successfully installed rubygems-update-1.0.0
Updating version of RubyGems to 1.0.1
ERROR:  While executing gem ... (Errno::ENOENT)
    No such file or directory -
/usr/lib/ruby/gems/1.8/gems/rubygems-update-1.0.1

----
os = mac osx 10.4
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