This command will randomly select one of the three URLs (www.example.com, www.example.net, or www.example.org) and silently retrieve the HTTP status code for that URL, writing it to the null device.
curl -sL -w "%{http_code}" $(shuf -n 1 <(echo -e "www.example.com\nwww.example.net\nwww.example.org")) -o /dev/null