Ruby can be downloaded here .
For further information on how to install Ruby on your operating system, read here .
Alternatively you can use RubyInstaller on Windows and rbenv and rvm on Unix & OSx.
Gem is a command-line tool interfacing with RubyGems, the package manager for the Ruby Programming language that provides a standard format for distributing Ruby programs and libraries (in a self-contained format called a “gem”).
To download and install Gem, follow the instructions here .
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