安装RVM后找不到Ruby 1.9.2

Question

I'm on Linux Ubuntu 12.04, and I first installed Ruby 1.9.2.

After I tried installing rvm to use Octopress, ruby --version in bash results in ruby 1.8.7 (2011-06-30 patchlevel 352) [x86_64-linux]

How can I use RVM with ruby 1.9.2?

I don't really understand what RVM is all about...

Answer 1

The 1.9.2 version you installed first is not accessible from rvm .

While working with rvm , only the list of rubies installed through rvm is served. The previously installed versions of ruby - while still present in the filesystem - are not included.

With the steps you have done so far, you have a 1.9.2 version installed in one location, and a 1.8.7 version installed as part of rvm .

Install 1.9,2 version by running the rvm install 1.9.2 command. After that, when you run the rvm list command, you should see an output similar to the following:

$ rvm list

rvm rubies

   ruby-1.8.7-p358 [ i686 ]
=* ruby-1.9.2-p320 [ x86_64 ]

# => - current
# =* - current && default
#  * - default

You can switch between different versions of ruby managed by rvm with the rvm use 1.8.7 / rvm use 1.9.2 commands.

Here's a short blogpost with a good intro to rvm: Get started right with RVM

Answer 2

Perhaps you have not yet switched to the ruby version with:

rvm use 1.9.2 (assuming you did rvm install 1.9.2)

for a more general explanation I gave an answer here which might help .

Answer 3

RVM is a version manager which enables you to decide which of multiple installed Ruby versions you want to use in your current shell session. RVM does this by providing a shell function named rvm which can be used to switch between versions in the current session. This changes environment variables, especially the GEM_HOME and PATH, to match the currently selected Ruby installation.

Every installed Ruby version can be selected by a specific identifier string. If you had a system-wide Ruby installation already before you installed RVM, that one should be referenced by the string system . The newly installed version in your case should be called 1.9.2 .

To make RVM work as intended, it is necessary to load the rvm shell function into your shell. How to do this is described in the RVM Installation Documentation in section 2 - "Load RVM into your shell sessions as a function".

You can see if the shell function is correctly loaded when the command type rvm | head -n1 type rvm | head -n1 responds with:

rvm is a shell function

If not correctly loaded it will tell you something like this:

rvm is /home/someone/.rvm/bin/rvm

If you finally have it working you can switch your active Ruby version with commands like rvm 1.9.2 or rvm system . You can get a list of all Ruby versions and their identifier strings recognized by RVM by the command rvm list .

You can also specify which Ruby version shall be enabled in all new shell sessions from the beginning by issuing the following command once:

rvm --default 1.9.2