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list rubies available
rvm list rubies
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use ruby
rvm use 1.9.3
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create a rvmrc project file for project using ruby 1.9.3
rvm --rvmrc --create 1.9.3@projectname
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list all the gem sets and indicates which one is currently in use
rvm gemset list
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use a gemset
rvm gemset use mygemset
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name of current gemset
rvm gemset name
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delete a gemset
rvm gemset delete mygemset