rbenv can't change global ruby version

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.

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

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

Run the below commands before change ruby version:

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

It works for me :)

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?

I realize that I occasionally set local ruby version in home folder, from which I use terminal by default :) So that's what worked for me:

rm /home/MYUSERNAME/.ruby-version

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

来源：https://stackoverflow.com/questions/24736204/rbenv-cant-change-global-ruby-version

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