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To install ruby 2.1.5 you can use either of methods(assuming Ubuntu)
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#### 1. Compile
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Compile from source. *sudo gem install* is used to install ruby gems
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Remove the old Ruby 1.8 if present
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```
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sudo apt-get remove ruby1.8
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```
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Download Ruby and compile it
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```
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mkdir /tmp/ruby && cd /tmp/ruby
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curl -L --progress http://cache.ruby-lang.org/pub/ruby/2.1/ruby-2.1.5.tar.gz | tar xz
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cd ruby-2.1.5./configure --disable-install-rdoc
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make
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sudo make install
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```
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Install the Bundler Gem
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```
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sudo gem install bundler --no-ri --no-rdoc
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```
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#### 2. RVM
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Use Ruby Version Mananger. *gem install* to install ruby gems
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Install RVM author's public key
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```
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gpg --keyserver hkp://keys.gnupg.net --recv-keys D39DC0E3
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```
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Install RVM with ruby(sudo password might be asked)
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```
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curl -sSL https://get.rvm.io | bash -s stable --ruby=2.1.5
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```
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Activate RVM
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```
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source ~/.rvm/scripts/rvm
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``` |
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