Ruby

Ruby is the language of TaskJuggler, Vagrant and MediaWiki-Vagrant.

There is a tool called ruby-switch that can allow you to check, list, and set the Ruby interpreter system-wide. This includes ruby, gem, irb, erb, testrb, rdoc, ri

ruby-switch --check
Currently using: ruby2.0
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ruby    -> /usr/bin/ruby2.0
gem     -> /usr/bin/gem2.0