Which Ruby version am I really running

Question

I m running Ubuntu 12 04 LTS  and installed Ruby via RVM   The problem is  when I type ruby -v into the terminal  it says that my Ruby version is 1 8 7  and using the shotgun gem for Sinatra also says that I m running Ruby 1 8 7    But when I type rvm list it shows that the only version of Ruby that I have installed is 2 0 0 and it is my current and default version   I installed Ruby 2 0 0 via RVM and it is the only version I had installed on my machine   Now when I tried to install Rails 4 but got an error saying that I need Ruby 1 9 or higher   How do I know what version am I really on  and how do I set 2 0 0 as my only version

User · Answer

If you have access to a console in the context you are investigating  you can determine which version you are running by printing the value of the global constant RUBY VERSION

User · Answer

On your terminal  try running   which -a ruby   This will output all the installed Ruby versions  via RVM  or otherwise  on your system in your PATH  If 1 8 7 is your system Ruby version  you can uninstall the system Ruby using   sudo apt-get purge ruby   Once you have made sure you have Ruby installed via RVM alone  in your login shell you can type   rvm --default use 2 0 0   You don t need to do this if you have only one Ruby version installed   If you still face issues with any system Ruby files  try running   dpkg-query -l   ruby     This will output a bunch of Ruby-related files and packages which are  or were  installed on your system at the system level  Check the status of each to find if any of them is native and is causing issues

User · Answer

The ruby version 1 8 7 seems to be your system ruby    Normally you can choose the ruby version you d like  if you are using rvm with following  Simple change into your directory in a new terminal and type in   rvm use 2 0 0   You can find more details about rvm here  http   rvm io  Open the website and scroll down  you will see a few helpful links   Setting up default rubies  for example could help you   Update  To set the ruby as default   rvm use 2 0 0 --default

User · Answer

Run this command   rvm get stable --auto-dotfiles   and make sure to read all the output  RVM will tell you if something is wrong  which in your case might be because GEM HOME is set to something different then PATH

[ruby-on-rails] Which Ruby version am I really running?

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