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CentOS 7にRuby 2.3.6をインストール

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(環境)

HW : raspberrypi2 model b
OS : CentOS 7.4
Ruby : 2.3.6

##gitをインストールする
途中でgit cloneする為

$ su -
# yum install git

##rbenvをインストール
rbenv(Simple Ruby Version Management)とはRubyのバージョンを簡単に切り替えられるコマンドラインツール

# git clone https://github.com/sstephenson/rbenv.git ~/.rbenv
#echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bash_profile
# echo 'eval "$(rbenv init -)"' >> ~/.bash_profile
# source ~/.bash_profile

##ruby-buildのインストール
ruby-buildはrbenvのプラグインでrbenv installが可能になる

# git clone git://github.com/sstephenson/ruby-build.git
# ~/.rbenv/plugins/ruby-build
# cd ~/.rbenv/plugins/ruby-build
# ./install.sh

##インストール可能なrubyバージョンを確認する。

rbenv install -l

##ruby 2.3.6をインストールする

# rbenv install 2.3.6

##インストール後

rubyのバージョンを特定できていないので下記のように表示される
# ruby -v
rbenv: ruby: command not found

The `ruby' command exists in these Ruby versions:
  2.3.6
globalでバージョンを指定する
# rbenv global 2.3.6

(参考)
https://qiita.com/Fendo181/items/d14ebfb148223c8e5ecb
https://qiita.com/Kaisyou/items/34ea9b5800434c1e09e6

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