Install a new version of Ruby (Rbenv documentation on GitHub--)

Https://github.com/sstephenson/rbenv

• Check out rbenv into ~/.rbenv .

  $ git clone https://github.com/sstephenson/rbenv.git ~/.rbenv

• Add to your for access to the ~/.rbenv/bin $PATH rbenv command-line utility.

  $ Echo ' Export path= ' $HOME/.rbenv/bin: $PATH "' >> ~/.bash_profile

  Ubuntu Desktop Note: Modify your ~/.bashrc instead of ~/.bash_profile .

  Zsh Note: Modify your ~/.zshrc file instead of ~/.bash_profile .

• Add to rbenv init your shell to enable shims and autocompletion.

  $ Echo ' eval ' $ (rbenv init-) "' >> ~/.bash_profile

  Same as in previous step, use on ~/.bashrc Ubuntu, or for ~/.zshrc Zsh.

• Restart your shell So, PATH changes take effect. (Opening a new terminal tab would usually do it.) Now check if Rbenv is set up:

  $ type rbenv#=> "Rbenv is a function"

• (Optional) Install Ruby-build, which provides the rbenv install command that simplifies the process ofinstalling new Ruby versions.

Upgrading

If you've installed rbenv manually using Git, you can upgrade your installation to the cutting-edge version at any time.

$ cd ~/.rbenv$ git pull

To use a specific release of rbenv, check out the corresponding tag:

$ cd ~/.rbenv$ git fetch$ git checkout v0.3.0--------------------------------------------

$rbenv Install--list If you don't see the version you want to install
$CD ~/.rbenv
$git Pull
$CD Plugins
$CD Ruby-build
$git Pull
$rbenv Install--list
$rbenv Install 2.1.2

========== If you can't download the =

View Https://github.com/sstephenson/ruby-build#readme

Package Download Caching

You can instruct Ruby-build to keep a local cache of downloaded package files by setting the environment RUBY_BUILD_CACHE_PATH variable. When set, package files would be kept in this directory after the first successful download and reused by subsequent Invoca tions of ruby-build and rbenv install .

rbenv installthe command defaults this path ~/.rbenv/cache to, so in the most cases you can enable download caching simply by creating that Di Rectory.

Create a new cache folder and manually download the installation package

2001 CD ~/.rbenv/
2002 LL
2003 MKDIR Cache
2004 CD Cha
2005 CD cache/
2006 Wget http://ruby.taobao.org/mirrors/ruby/ruby-2.2.2.tar.gz
cd
Rbenv Install 2.2.2-v

=====================

$ruby-V
$rbenv Global 2.1.2
$rbenv versions
There is one other way
$export rbenv_version=2.1.2
However, this method is only valid in the current terminal window
$gem Install Rails
At this point, we find that the speed is super slow
$gem List
$gem source-l
Come to the web to see the ruby.taobao.org, and then follow the web prompt operation
$gem sources--remove http://rubygems.org/
....
$gem Install Rails

Install a new version of Ruby (Rbenv documentation on GitHub--)