title: Can an ~/.ssh/config file use variables?
body: <p>I am writing an SSH config file and want to perform a bit of logic. For example:</p>
  
  <pre><code>Host myhost1
      ProxyCommand ssh -A {choose randomly between [bastion_host1] and [bastion_host2]} -W %h:%p
  </code></pre>
  
  <p>Is it possible to achieve the above using (bash?) variables? Thanks!</p>