curl -o /dev/null -s -w %{http_code}:%{http_connect}:%{content_type}:%{time_namelookup}:%{time_redirect}:%{time_pretransfer}:%{time_connect}:%{time_starttransfer}:%{time_total}:%{speed_download} http://www.baidu.com
或者
curl -o /dev/null -s -w %{http_code}:%{time_connect}:%{time_starttransfer}:%{time_total} http://www.baidu.com