I am considering changing to circleci for our company, but many of our pipelines require R.
I did not encounter any sections which state that R is supported, but (if possible) I could install it directly on the commandline via bash.
Is this an option if I would move towards circleci ?
You should have not problem using R. We don’t have any docs for it, but our builds run in Ubuntu 14.04 LTS by default and you have root access so you can install (and cache) most tools without any problems.