如何更改 ruby​​ 版本

How to change ruby version

提问by sorush-r

Ruby 1.8 and 1.9 are installed in my Ubuntu machine. I've just installed Ruby 2.0.0 from ppa:brightbox/ruby-ng-experimentalto install a bundle which requires 2.0.0. Now all 1.8, 1.9 and 2.0 are installed though I can't tell bundle to use 2.0:

Ruby 1.8 和 1.9 安装在我的 Ubuntu 机器上。我刚刚安装了 Ruby 2.0.0ppa:brightbox/ruby-ng-experimental来安装需要 2.0.0 的包。现在所有 1.8、1.9 和 2.0 都已安装，但我无法告诉 bundle 使用 2.0：

$ bundle install
$ Your Ruby version is 1.9.3, but your Gemfile specified 2.0.0

RVM fails to change version:

RVM 无法更改版本：

$ rvm 2.0
$ ruby-2.0.0-p451 is not installed.
$ To install do: 'rvm install ruby-2.0.0-p451'

RBENV also does not recognize 2.0:

RBENV 也无法识别 2.0：

$ rbenv global 2.0.0-p451
$ rbenv: version `2.0.0-p451' not installed

回答by Felix

There is lots of advise in the comments to your question, some of it is advanced-ish rbenv or rvm usage.

对您的问题的评论中有很多建议，其中一些是高级的 rbenv 或 rvm 用法。

My advice: Decide on how to manage multiple rubies - either use your OS package manager (in your case the apt-get/PPA stuff) OR rvmOR rbenv.

我的建议：决定如何管理多个红宝石——要么使用你的操作系统包管理器（在你的情况下是apt-get/PPA 东西）或rvm或rbenv。

For the OS package manager, there should be a way to call ruby with version explicitely (e.g. /usr/bin/ruby1.9.3), or research on and call update-alternative. As bundler comes with a gem, you might get the interpreters confused here.

对于操作系统包管理器，应该有一种方法可以显式调用带有版本的 ruby​​（例如/usr/bin/ruby1.9.3），或者研究并调用update-alternative. 由于 bundler 带有一个 gem，你可能会在这里混淆解释器。

For rvm, change ruby version with rvm use 2.5.1(once it is installed).

对于 rvm，使用rvm use 2.5.1（安装后）更改 ruby​​ 版本。

For rbenv I actually do not know but it should be trivial, too (and people are happy with it; it just happens that I tried rvm first and it worked like a charm, never evaluated rbenv).

对于 rbenv，我实际上不知道，但它也应该是微不足道的（人们对此很满意；碰巧我首先尝试了 rvm 并且它的工作很吸引人，从未评估过 rbenv）。

I usually install one "system" ruby (apt-get install ruby1.9.3) and use rvm afterwards. You can still switch to the packaged "production" ruby with rvm use system.

我通常安装一个“系统”ruby（apt-get install ruby​​1.9.3）然后使用rvm。您仍然可以使用rvm use system.

Update 2017: Most distros ship with a ruby version installed already, so you probably don't have to install it manually. Run ruby -vor which rubyto see if a ruby interpreter is already installed.

2017 年更新：大多数发行版都已经安装了 ruby​​ 版本，因此您可能不必手动安装它。运行ruby -v或which ruby查看是否已经安装了 ruby​​ 解释器。

In your case I would probably deinstall all system rubys (apt-get purge ...), remove the PPAs, remove your ~/.rvm and rbenv and start from scratch (install packaged stable ruby, then rvmand use rvm (r.g. rvm install 2.3.1) from there on).

在您的情况下，我可能会卸载所有系统 ruby​​ ( apt-get purge ...)，删除 PPA，删除您的 ~/.rvm 和 rbenv 并从头开始（安装打包的稳定 ruby​​，然后rvm并rvm install 2.3.1从那里使用 rvm (rg )）。

回答by Gamaliel

Adding the repository If you're using Ubuntu 14.04 (Trusty) or newer then you can add the package repository like this:

添加存储库如果您使用的是 Ubuntu 14.04 (Trusty) 或更新版本，那么您可以像这样添加包存储库：

$ sudo apt-get install software-properties-common
$ sudo apt-add-repository ppa:brightbox/ruby-ng
$ sudo apt-get update

Install ruby switch

安装红宝石开关

$ sudo apt-get install ruby-switch

Commands of utiliy

实用命令

ruby -v
ruby-switch --list

Example

例子

$ sudo ruby-switch --set ruby2.1

Hope this help you.

希望这对你有帮助。

From: https://www.brightbox.com/docs/ruby/ubuntu/

来自：https: //www.brightbox.com/docs/ruby/ubuntu/