The closest thing I could get working for real was: curl -s -X POST https://lite.duckduckgo.com/lite/ -H 'Content-Type: application/x-www-form-urlencoded' -d

The closest thing I could get working for real was: curl -s -X POST https://lite.duckduckgo.com/lite/ -H 'Content-Type: application/x-www-form-urlencoded' -d 'q=foo+site:news.ycombinator.com' | grep 'rel="nofollow"'