rvm: ruby version manager
Mac下升级Ruby
1. 安装rvm（ruby版本管理器）
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ruby -v
ruby 2.0.0p648 (2015-12-16 revision 53162) [universal.x86_64-darwin15]
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curl -L get.rvm.io | bash -s stable
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2. 配置资源
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source ~/.bashrc
source ~/.bash_profile
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3. 查看版本
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rvm -v
rvm 1.27.0 (latest) by Wayne E. Seguin <wayneeseguin@gmail.com>, Michal Papis <mpapis@gmail.com> [https://rvm.io/]
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4. 查看可安装的ruby版本
5. 安装Homebrew
中间可能需要输入密码等同意即可，等待安装配置完成
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rvm requirements
Checking requirements for osx.
About to install Homebrew, press `Enter` for default installation in `/usr/local`,
type new path if you wish custom Homebrew installation (the path needs to be writable for user)
:
==> This script will install:
......
Checking requirements for osx.
Installing requirements for osx.
Updating system.....
Installing required packages: openssl...
Certificates in '/usr/local/etc/openssl/cert.pem' are already up to date.
Requirements installation successful.
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6. 安装ruby
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rvm install 2.3.0
......
Install of ruby-2.3.0 - #complete
Ruby was built without documentation, to build it run: rvm docs generate-ri
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7. 安装完成
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ruby -v
ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-darwin15]
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