title: how to pass bash variable as ssh-keygen argument?
body: <p>I'm trying to do this</p>
  
  <pre><code>REPO="wordpress-sites" ssh-keygen -t rsa -f ~/.ssh/${REPO}_rsa -C "${REPO} deploy"
  </code></pre>
  
  <p>but <code>REPO</code> shows as <code>""</code></p>
  
  <p>If I do <code>export REPO="wordpress-sites"</code> then <code>REPO</code> is set permanently which I don't want.</p>