rbenv 无法更改全局 ruby​​ 版本

Question

My Mac OS X has a default ruby.

$ ruby -v
ruby 2.0.0p451 (2014-02-24 revision 45167) [universal.x86_64-darwin13]

I installed rbenv and ruby version 2.1.2.

$ rbenv versions
  system
* 2.1.2 (set by /Users/sdw/.rbenv/version)

and I tried to set the global ruby version to 2.1.2, but nothing happened.

$ rbenv global 2.1.2
$ ruby -v
ruby 2.0.0p451 (2014-02-24 revision 45167) [universal.x86_64-darwin13]

So I tried to do the same thing with command sudo , but the result is the same.

$ sudo rbenv global 2.1.2
$ ruby -v
ruby 2.0.0p451 (2014-02-24 revision 45167) [universal.x86_64-darwin13]

How can I change my global ruby version to 2.1.2? I never installed rvm or other ruby version managing system.

Answer 1

Did you add the following lines to your ~/.bash_profile ?

export PATH="$HOME/.rbenv/bin:$PATH"
eval "$(rbenv init -)"

See: https://github.com/sstephenson/rbenv#installation

Answer 2

Type $ rbenv version (without "s")

It is possible that output will show a path to the file that is locking the version

2.0.0p451 (set by /path/to/some/directory/.ruby-version)

It is even possible that the file is a hidden file named .ruby-version in your current dir. If its the case just remove that .ruby-version file

Answer 3

我意识到我偶尔会在主文件夹中设置本地 ruby​​ 版本，默认情况下我使用终端 :) 所以这对我有用：

rm /home/MYUSERNAME/.ruby-version

Answer 4

Run the below commands before change ruby version:

export PATH="$HOME/.rbenv/bin:$PATH"
eval "$(rbenv init -)"

It works for me :)

Answer 5

Uninstall ruby and then install agains:

brew uninstall -f ruby
brew install ruby

Add this two line to you ~/.bash_profile

export PATH="$HOME/.rbenv/bin:$PATH"
eval "$(rbenv init -)"

Reopen the console and that's it and run

ruby -v 

Answer 6

I had the same issue ("ruby -v" showing the initial version) but reloading (exit/start) my terminal made the trick.

Did you try that first?

Answer 7

If you are installing ruby on rails on ubuntu,and you rbenv doesn't change your ruby version

> rbenv list # This lists all the rbenv versions available

• 2.6.8
• 2.7.4
• 3.0.2
• jruby-9.3.1.0
• mruby-3.0.0
• rbx-5.0
  -truffleruby-21.3.0
  -truffleruby+graalvm-21.3.0

In my case I need to install ruby 3.0.2

rbenv install 3.0.2

After this also it shows ruby v [2.7.0-]

rbenv global 3.0.2

This will help you change your ruby version.

Answer 8

instead of:
rbenv global 2.7.1
do:
sudo rbenv global 2.7.1