macOS10.14.3 gem更新和用法详解

1、更新gem

sudo gem update --system -n /usr/local/bin

打印遇到error

Updating rubygems-update
Successfully installed rubygems-update-3.0.3
Parsing documentation for rubygems-update-3.0.3
Installing ri documentation for rubygems-update-3.0.3
Installing darkfish documentation for rubygems-update-3.0.3
Done installing documentation for rubygems-update after 52 seconds
Parsing documentation for rubygems-update-3.0.3
Done installing documentation for rubygems-update after 0 seconds
Installing RubyGems 3.0.3
ERROR:  While executing gem ... (Errno::EPERM)
    Operation not permitted @ rb_sysopen - /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/bin/gem

显示gem 升级成功

gem -v
3.0.3

在安装cocopods时，使用sudo gem install -n /usr/local/bin cocoapods 代替sudo gem install cocoapods --pre

注：所以不要轻易升级

关于源的问题

如果遇到WARNING: Unable to pull data from ‘http://ruby.taobao.org/’: bad response Not Found 404 (http://ruby.taobao.org/specs.4.8.gz) 9 gems installed问题

gem sources --remove http://ruby.taobao.org/

gem sources -a  https://gems.ruby-china.com/

最新的方法点击这里https://ruby.taobao.com/

gem sources -a https://gems.ruby-china.com/

查看源对不对

  gem sources -l

更换数据源再按照原来安装

现在能用国内的源是 https://gems.ruby-china.com/