How to use a certain ruby version?

Question

I try to run a script on a LFS Batchsystem. The cluster offers an older version of ruby, so I had to install my gems and rvm locally on my account. Is there a way to run my local installed ruby version on a batch system? My script works fine on my account but not on LFS because mechanize depends on a newer ruby version.

Answer 1

I solved my problem with directly using the binary version and to define my local gem folder:

GEM_HOME=/home/my_name/.rvm/gems/ruby-2.0.0-p195/gems
/home/my_name/.rvm/bin/ruby-2.0.0-p195 my_script.rb

The other solutions do not work, because rvm is not available on the cluster.

Answer 2

Make sure you have rvm then

rvm use 1.9.3

or to set the default:

rvm use --default 1.9.3

And obviously, replace 1.9.3 with the version you want to use

Answer 3

Create .rvmrc file in your working directory in that you would mention which version of ruby you are going to you like:

rvm use 1.9.3@gemsetname --create

Now you can install all gems for this particular gemset.