title: How can I determine the full CUDA version + subversion?
body: <p>CUDA distributions on Linux used to have a file named <code>version.txt</code> which read, e.g.:</p>
  <pre><code>CUDA Version 10.2.89
  </code></pre>
  <p>which is quite useful. However, as of CUDA 11.1, this file no longer exists.</p>
  <p>How can I determine, on Linux and from the command line, and inspecting <code>/path/to/cuda/toolkit</code>, which exact version I'm looking at? Including the subversion?</p>