RVM baby 版本管理器

RVM baby 版本管理器 

安装 RVM baby 版本管理器 

$curl -L get.rvm.io | bash -s stable
打印代码：

In case of problems: https://rvm.io/help and https://twitter.com/rvm_io

说明安装成功

查看当前信息

$ source ~/.bashrc  

$source ~/.bash_profile  

$rvm -v  
打印代码：

rvm 1.27.0 (latest) by Wayne E. Seguin @gmail.com>, Michal Papis @gmail.com> [https://rvm.io/]

用RVM升级Ruby查看当前ruby版本

$ruby -v 

$rvm list known
打印代码

# MRI Rubies
[ruby-]1.8.6[-p420]
[ruby-]1.8.7[-head] # security released on head
[ruby-]1.9.1[-p431]
[ruby-]1.9.2[-p330]
[ruby-]1.9.3[-p551]
[ruby-]2.0.0[-p648]
[ruby-]2.1[.8]
[ruby-]2.2[.4]
[ruby-]2.3[.0]
[ruby-]2.2-head
ruby-head

# for forks use: rvm install ruby-head- --url https://github.com/github/ruby.git --branch 2.2

# JRuby
jruby-1.6[.8]
jruby-1.7[.23]
jruby[-9.0.5.0]
jruby-head

# Rubinius
rbx-1[.4.3]
rbx-2.3[.0]
rbx-2.4[.1]
rbx[-2.5.8]
rbx-head

安装ruby 2.2.2 版本

$rvm install 2.2.2
如果打印：

…  ruby-2.2.2 - #validate archive
    ruby-2.2.2 - #extract
    ruby-2.2.2 - #validate binary
    ruby-2.2.2 - #setup
    ruby-2.2.2 - #gemset created /Users/abc/.rvm/gems/ruby-2.2.2@global
    ruby-2.2.2 - #importing gemset             
   /Users/abc/.rvm/gemsets/global.gems..............................
    ruby-2.2.2 - #generating global wrappers........
    ruby-2.2.2 - #gemset created /Users/abc/.rvm/gems/ruby-2.2.2
    ruby-2.2.2 - #importing gemsetfile /Users/abc/.rvm/gemsets/default.gems                          
 　　evaluated to empty gem list 
    ruby-2.2.2 - #generating default wrappers........
    Updating certificates in '/etc/openssl/cert.pem'.
    mkdir: /etc/openssl: Permission denied
    mkdir -p "/etc/openssl" failed, retrying with sudo
    LiuWenqiang password required for 'mkdir -p /etc/openssl': 
    and sudo mkdir worked

 则说明安装成功了
 打印代码：
 

Done with Command Line Tools (OS X 10.11) for Xcode
Done.
==> /usr/bin/sudo /bin/rm -f /tmp/.com.apple.dt.CommandLineTools.installondemand.in-progress
==> Installing the Command Line Tools (expect a GUI popup):
==> /usr/bin/sudo /usr/bin/xcode-select --install
xcode-select: error: command line tools are already installed, use "Software Update" to install updates
Failed during: /usr/bin/sudo /usr/bin/xcode-select --install
Requirements installation failed with status: 1.

则失败。
如果安装失败，解决方案：
$ sudo xcode-select –switch /Library/Developer/CommandLineTools/

Password: （输入电脑权限密码）

$ git

usage: git [--version] [--help] [-C ] [-c name=value]

[--exec-path[=]] [--html-path] [--man-path] [--info-path]

[-p | --paginate | --no-pager] [--no-replace-objects] [--bare]

[--git-dir=] [--work-tree=] [--namespace=]

<command> []

第二个问题就解决了
然后再重新执行：安装2.2.2版本 步骤 就可以解决

查看当前ruby 版本

$ruby -v

    ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-darwin14]

现在ruby版本已经是2.2.2了

继续安装 CocoaPods

$sudo gem install cocoa pods

$sudo gem install -n /usr/local/bin cocoapods

$pod setup

更新 gem

$ sudo gem update –system