title: GNU Parallel echo job number
body: <p>So I have this code: <code>parallel --jobs 5 curl --write-out '\\n  %{http_code}\\n' --silent --head --output /dev/null https://example.com/id={} ::: {427240690783..427240690793}</code></p>
  <p>Which returns 10 lots of 404's.</p>
  <p>If the HTTP Response code was 200, I want to echo out the current job iteration ID, displayed within the {}. How would I go about echoing these?</p>
  <p>Apologies, I'm brand new to GNU.</p>