Mac升级ruby到最新版本_ruby is keg-only, which means it was not symlinked

简述

Mac自带的Ruby版本过低

插件

需要提前安装Brew

查看当前Ruby版本

ruby -v
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显示

ruby 2.3.7p456 (2018-03-28 revision 63024) [universal.x86_64-darwin18]
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升级ruby

执行下面的命令

brew install ruby
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安装完成后会有一段提示

You may want to add this to your PATH.

ruby is keg-only, which means it was not symlinked into /usr/local,
because macOS already provides this software and installing another version in
parallel can cause all kinds of trouble.

If you need to have ruby first in your PATH run:
  echo 'export PATH="/usr/local/opt/ruby/bin:$PATH"' >> ~/.bash_profile

For compilers to find ruby you may need to set:
  export LDFLAGS="-L/usr/local/opt/ruby/lib"
  export CPPFLAGS="-I/usr/local/opt/ruby/include"

# ==============翻译后 来自百度翻译==============
您可能想将此添加到您的路径中。
ruby只是keg，这意味着它没有符号链接到/usr/local，
因为macOS已经提供了这个软件并在
平行会引起各种各样的麻烦。
如果需要在运行路径时首先运行ruby：

echo 'export PATH="/usr/local/opt/ruby/bin:$PATH"' >> ~/.bash_profile

编译器要查找ruby，可能需要设置：
export LDFLAGS=“-L/usr/local/opt/ruby/lib”
export CPPFLAGS=“-I/usr/local/opt/ruby/include”
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设置环境变量

根据提示打开文件

vi .bash_profile
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将

export PATH="/usr/local/opt/ruby/bin:$PATH"
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添加到文件最后一行
执行下面的命令

source .bash_profile
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再次查看Ruby版本

ruby -v
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显示

ruby 2.6.5p114 (2019-10-01 revision 67812) [x86_64-darwin18]
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至此升级完毕