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rvm is a necessary tool to run different version of ruby.

Once in a while I need to upgrade ruby version, but rvm’s official doc is a bit too dense.

Beyond installing, there are just a few commands that you really need.

Install the latest

rvm install ruby --latest

Or manually specify a version with rvm install ruby 2.0.0-p247

Set the default version

rvm --default use ruby-2.6.3

The default option is often needed, because without it, when you reload the terminal or restart the computer, it will use back the previous.

To confirm the version in use:

ruby -v
which ruby

Other commands

# List my rubies
rvm list

# List all the known rubies
rvm list known

# Update rvm and known rubies
rvm get stable